diff --git a/src/test/java/dk/camelot64/kickc/test/TestPrograms.java b/src/test/java/dk/camelot64/kickc/test/TestPrograms.java
index db212128e..20fbcc2d0 100644
--- a/src/test/java/dk/camelot64/kickc/test/TestPrograms.java
+++ b/src/test/java/dk/camelot64/kickc/test/TestPrograms.java
@@ -1011,6 +1011,11 @@ public class TestPrograms {
       assertError("cast-error.c", "Type mismatch");
    }
 
+   @Test
+   public void testInlineAsmMaVar() throws IOException, URISyntaxException {
+      compileAndCompare("inline-asm-ma-var.c");
+   }
+
    @Test
    public void testInlineAsmParam() throws IOException, URISyntaxException {
       compileAndCompare("inline-asm-param.c");
diff --git a/src/test/kc/inline-asm-ma-var.c b/src/test/kc/inline-asm-ma-var.c
new file mode 100644
index 000000000..6cfa8d3a5
--- /dev/null
+++ b/src/test/kc/inline-asm-ma-var.c
@@ -0,0 +1,17 @@
+// Test access to __ma variable from inline ASM
+
+char * const SCREEN = 0x0400; 
+
+void main() {
+    __ma char value = 0;
+    for(char i=0;i<10;i++) {
+
+        value += i;
+
+        asm {
+            lda #$55
+            eor value
+            sta SCREEN
+        }
+    }    
+}
diff --git a/src/test/ref/inline-asm-ma-var.asm b/src/test/ref/inline-asm-ma-var.asm
new file mode 100644
index 000000000..d5739adc9
--- /dev/null
+++ b/src/test/ref/inline-asm-ma-var.asm
@@ -0,0 +1,31 @@
+// Test access to __ma variable from inline ASM
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+  .label SCREEN = $400
+main: {
+    .label value = 2
+    // value = 0
+    lda #0
+    sta.z value
+    tax
+  __b1:
+    // for(char i=0;i<10;i++)
+    cpx #$a
+    bcc __b2
+    // }
+    rts
+  __b2:
+    // value += i
+    txa
+    clc
+    adc.z value
+    sta.z value
+    // asm
+    lda #$55
+    eor value
+    sta SCREEN
+    // for(char i=0;i<10;i++)
+    inx
+    jmp __b1
+}
diff --git a/src/test/ref/inline-asm-ma-var.cfg b/src/test/ref/inline-asm-ma-var.cfg
new file mode 100644
index 000000000..ab97fb57a
--- /dev/null
+++ b/src/test/ref/inline-asm-ma-var.cfg
@@ -0,0 +1,26 @@
+@begin: scope:[]  from
+  [0] phi()
+  to:@1
+@1: scope:[]  from @begin
+  [1] phi()
+  [2] call main 
+  to:@end
+@end: scope:[]  from @1
+  [3] phi()
+
+(void()) main()
+main: scope:[main]  from @1
+  [4] (byte) main::value ← (byte) 0
+  to:main::@1
+main::@1: scope:[main]  from main main::@2
+  [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@2/(byte) main::i#1 )
+  [6] if((byte) main::i#2<(byte) $a) goto main::@2
+  to:main::@return
+main::@return: scope:[main]  from main::@1
+  [7] return 
+  to:@return
+main::@2: scope:[main]  from main::@1
+  [8] (byte) main::value ← (byte) main::value + (byte) main::i#2
+  asm { lda#$55 eorvalue staSCREEN  }
+  [10] (byte) main::i#1 ← ++ (byte) main::i#2
+  to:main::@1
diff --git a/src/test/ref/inline-asm-ma-var.log b/src/test/ref/inline-asm-ma-var.log
new file mode 100644
index 000000000..529327b08
--- /dev/null
+++ b/src/test/ref/inline-asm-ma-var.log
@@ -0,0 +1,375 @@
+
+CONTROL FLOW GRAPH SSA
+@begin: scope:[]  from
+  to:@1
+
+(void()) main()
+main: scope:[main]  from @1
+  (byte) main::value ← (byte) 0
+  (byte) main::i#0 ← (byte) 0
+  to:main::@1
+main::@1: scope:[main]  from main main::@2
+  (byte) main::i#2 ← phi( main/(byte) main::i#0 main::@2/(byte) main::i#1 )
+  (bool~) main::$0 ← (byte) main::i#2 < (number) $a
+  if((bool~) main::$0) goto main::@2
+  to:main::@return
+main::@2: scope:[main]  from main::@1
+  (byte) main::i#3 ← phi( main::@1/(byte) main::i#2 )
+  (byte) main::value ← (byte) main::value + (byte) main::i#3
+  asm { lda#$55 eorvalue staSCREEN  }
+  (byte) main::i#1 ← ++ (byte) main::i#3
+  to:main::@1
+main::@return: scope:[main]  from main::@1
+  return 
+  to:@return
+@1: scope:[]  from @begin
+  call main 
+  to:@2
+@2: scope:[]  from @1
+  to:@end
+@end: scope:[]  from @2
+
+SYMBOL TABLE SSA
+(label) @1
+(label) @2
+(label) @begin
+(label) @end
+(const nomodify byte*) SCREEN = (byte*)(number) $400
+(void()) main()
+(bool~) main::$0
+(label) main::@1
+(label) main::@2
+(label) main::@return
+(byte) main::i
+(byte) main::i#0
+(byte) main::i#1
+(byte) main::i#2
+(byte) main::i#3
+(byte) main::value loadstore
+
+Adding number conversion cast (unumber) $a in (bool~) main::$0 ← (byte) main::i#2 < (number) $a
+Successful SSA optimization PassNAddNumberTypeConversions
+Simplifying constant pointer cast (byte*) 1024
+Simplifying constant integer cast $a
+Successful SSA optimization PassNCastSimplification
+Finalized unsigned number type (byte) $a
+Successful SSA optimization PassNFinalizeNumberTypeConversions
+Alias main::i#2 = main::i#3 
+Successful SSA optimization Pass2AliasElimination
+Simple Condition (bool~) main::$0 [4] if((byte) main::i#2<(byte) $a) goto main::@2
+Successful SSA optimization Pass2ConditionalJumpSimplification
+Constant (const byte) main::i#0 = 0
+Successful SSA optimization Pass2ConstantIdentification
+Inlining constant with var siblings (const byte) main::i#0
+Constant inlined main::i#0 = (byte) 0
+Successful SSA optimization Pass2ConstantInlining
+Adding NOP phi() at start of @begin
+Adding NOP phi() at start of @1
+Adding NOP phi() at start of @2
+Adding NOP phi() at start of @end
+CALL GRAPH
+Calls in [] to main:2 
+
+Created 1 initial phi equivalence classes
+Coalesced [12] main::i#4 ← main::i#1
+Coalesced down to 1 phi equivalence classes
+Culled Empty Block (label) @2
+Adding NOP phi() at start of @begin
+Adding NOP phi() at start of @1
+Adding NOP phi() at start of @end
+
+FINAL CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  [0] phi()
+  to:@1
+@1: scope:[]  from @begin
+  [1] phi()
+  [2] call main 
+  to:@end
+@end: scope:[]  from @1
+  [3] phi()
+
+(void()) main()
+main: scope:[main]  from @1
+  [4] (byte) main::value ← (byte) 0
+  to:main::@1
+main::@1: scope:[main]  from main main::@2
+  [5] (byte) main::i#2 ← phi( main/(byte) 0 main::@2/(byte) main::i#1 )
+  [6] if((byte) main::i#2<(byte) $a) goto main::@2
+  to:main::@return
+main::@return: scope:[main]  from main::@1
+  [7] return 
+  to:@return
+main::@2: scope:[main]  from main::@1
+  [8] (byte) main::value ← (byte) main::value + (byte) main::i#2
+  asm { lda#$55 eorvalue staSCREEN  }
+  [10] (byte) main::i#1 ← ++ (byte) main::i#2
+  to:main::@1
+
+
+VARIABLE REGISTER WEIGHTS
+(void()) main()
+(byte) main::i
+(byte) main::i#1 202.0
+(byte) main::i#2 101.0
+(byte) main::value loadstore 35.5
+
+Initial phi equivalence classes
+[ main::i#2 main::i#1 ]
+Added variable main::value to live range equivalence class [ main::value ]
+Complete equivalence classes
+[ main::i#2 main::i#1 ]
+[ main::value ]
+Allocated zp[1]:2 [ main::i#2 main::i#1 ]
+Allocated zp[1]:3 [ main::value ]
+
+INITIAL ASM
+Target platform is c64basic / MOS6502X
+  // File Comments
+// Test access to __ma variable from inline ASM
+  // Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+  // Global Constants & labels
+  .label SCREEN = $400
+  // @begin
+__bbegin:
+  // [1] phi from @begin to @1 [phi:@begin->@1]
+__b1_from___bbegin:
+  jmp __b1
+  // @1
+__b1:
+  // [2] call main 
+  jsr main
+  // [3] phi from @1 to @end [phi:@1->@end]
+__bend_from___b1:
+  jmp __bend
+  // @end
+__bend:
+  // main
+main: {
+    .label value = 3
+    .label i = 2
+    // [4] (byte) main::value ← (byte) 0 -- vbuz1=vbuc1 
+    lda #0
+    sta.z value
+    // [5] phi from main to main::@1 [phi:main->main::@1]
+  __b1_from_main:
+    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuz1=vbuc1 
+    lda #0
+    sta.z i
+    jmp __b1
+    // main::@1
+  __b1:
+    // [6] if((byte) main::i#2<(byte) $a) goto main::@2 -- vbuz1_lt_vbuc1_then_la1 
+    lda.z i
+    cmp #$a
+    bcc __b2
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [7] return 
+    rts
+    // main::@2
+  __b2:
+    // [8] (byte) main::value ← (byte) main::value + (byte) main::i#2 -- vbuz1=vbuz1_plus_vbuz2 
+    lda.z value
+    clc
+    adc.z i
+    sta.z value
+    // asm { lda#$55 eorvalue staSCREEN  }
+    lda #$55
+    eor value
+    sta SCREEN
+    // [10] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuz1=_inc_vbuz1 
+    inc.z i
+    // [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
+  __b1_from___b2:
+    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
+    jmp __b1
+}
+  // File Data
+
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [4] (byte) main::value ← (byte) 0 [ main::value ] ( main:2 [ main::value ] { }  ) always clobbers reg byte a 
+Statement [8] (byte) main::value ← (byte) main::value + (byte) main::i#2 [ main::value main::i#2 ] ( main:2 [ main::value main::i#2 ] { }  ) always clobbers reg byte a 
+Removing always clobbered register reg byte a as potential for zp[1]:2 [ main::i#2 main::i#1 ]
+Statement asm { lda#$55 eorvalue staSCREEN  } always clobbers reg byte a 
+Statement [4] (byte) main::value ← (byte) 0 [ main::value ] ( main:2 [ main::value ] { }  ) always clobbers reg byte a 
+Statement [8] (byte) main::value ← (byte) main::value + (byte) main::i#2 [ main::value main::i#2 ] ( main:2 [ main::value main::i#2 ] { }  ) always clobbers reg byte a 
+Statement asm { lda#$55 eorvalue staSCREEN  } always clobbers reg byte a 
+Potential registers zp[1]:2 [ main::i#2 main::i#1 ] : zp[1]:2 , reg byte x , reg byte y , 
+Potential registers zp[1]:3 [ main::value ] : zp[1]:3 , 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [main] 303: zp[1]:2 [ main::i#2 main::i#1 ] 35.5: zp[1]:3 [ main::value ] 
+Uplift Scope [] 
+
+Uplifting [main] best 398 combination reg byte x [ main::i#2 main::i#1 ] zp[1]:3 [ main::value ] 
+Uplifting [] best 398 combination 
+Attempting to uplift remaining variables inzp[1]:3 [ main::value ]
+Uplifting [main] best 398 combination zp[1]:3 [ main::value ] 
+Allocated (was zp[1]:3) zp[1]:2 [ main::value ]
+
+ASSEMBLER BEFORE OPTIMIZATION
+  // File Comments
+// Test access to __ma variable from inline ASM
+  // Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+  // Global Constants & labels
+  .label SCREEN = $400
+  // @begin
+__bbegin:
+  // [1] phi from @begin to @1 [phi:@begin->@1]
+__b1_from___bbegin:
+  jmp __b1
+  // @1
+__b1:
+  // [2] call main 
+  jsr main
+  // [3] phi from @1 to @end [phi:@1->@end]
+__bend_from___b1:
+  jmp __bend
+  // @end
+__bend:
+  // main
+main: {
+    .label value = 2
+    // [4] (byte) main::value ← (byte) 0 -- vbuz1=vbuc1 
+    lda #0
+    sta.z value
+    // [5] phi from main to main::@1 [phi:main->main::@1]
+  __b1_from_main:
+    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
+    ldx #0
+    jmp __b1
+    // main::@1
+  __b1:
+    // [6] if((byte) main::i#2<(byte) $a) goto main::@2 -- vbuxx_lt_vbuc1_then_la1 
+    cpx #$a
+    bcc __b2
+    jmp __breturn
+    // main::@return
+  __breturn:
+    // [7] return 
+    rts
+    // main::@2
+  __b2:
+    // [8] (byte) main::value ← (byte) main::value + (byte) main::i#2 -- vbuz1=vbuz1_plus_vbuxx 
+    txa
+    clc
+    adc.z value
+    sta.z value
+    // asm { lda#$55 eorvalue staSCREEN  }
+    lda #$55
+    eor value
+    sta SCREEN
+    // [10] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
+    inx
+    // [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
+  __b1_from___b2:
+    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
+    jmp __b1
+}
+  // File Data
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp __b1
+Removing instruction jmp __bend
+Removing instruction jmp __b1
+Removing instruction jmp __breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction __b1_from___bbegin:
+Removing instruction __b1:
+Removing instruction __bend_from___b1:
+Succesful ASM optimization Pass5RedundantLabelElimination
+Removing instruction __bbegin:
+Removing instruction __bend:
+Removing instruction __b1_from_main:
+Removing instruction __breturn:
+Removing instruction __b1_from___b2:
+Succesful ASM optimization Pass5UnusedLabelElimination
+Removing instruction jsr main
+Succesful ASM optimization Pass5SkipBegin
+Replacing instruction ldx #0 with TAX
+
+FINAL SYMBOL TABLE
+(label) @1
+(label) @begin
+(label) @end
+(const nomodify byte*) SCREEN = (byte*) 1024
+(void()) main()
+(label) main::@1
+(label) main::@2
+(label) main::@return
+(byte) main::i
+(byte) main::i#1 reg byte x 202.0
+(byte) main::i#2 reg byte x 101.0
+(byte) main::value loadstore zp[1]:2 35.5
+
+reg byte x [ main::i#2 main::i#1 ]
+zp[1]:2 [ main::value ]
+
+
+FINAL ASSEMBLER
+Score: 326
+
+  // File Comments
+// Test access to __ma variable from inline ASM
+  // Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+  // Global Constants & labels
+  .label SCREEN = $400
+  // @begin
+  // [1] phi from @begin to @1 [phi:@begin->@1]
+  // @1
+  // [2] call main 
+  // [3] phi from @1 to @end [phi:@1->@end]
+  // @end
+  // main
+main: {
+    .label value = 2
+    // value = 0
+    // [4] (byte) main::value ← (byte) 0 -- vbuz1=vbuc1 
+    lda #0
+    sta.z value
+    // [5] phi from main to main::@1 [phi:main->main::@1]
+    // [5] phi (byte) main::i#2 = (byte) 0 [phi:main->main::@1#0] -- vbuxx=vbuc1 
+    tax
+    // main::@1
+  __b1:
+    // for(char i=0;i<10;i++)
+    // [6] if((byte) main::i#2<(byte) $a) goto main::@2 -- vbuxx_lt_vbuc1_then_la1 
+    cpx #$a
+    bcc __b2
+    // main::@return
+    // }
+    // [7] return 
+    rts
+    // main::@2
+  __b2:
+    // value += i
+    // [8] (byte) main::value ← (byte) main::value + (byte) main::i#2 -- vbuz1=vbuz1_plus_vbuxx 
+    txa
+    clc
+    adc.z value
+    sta.z value
+    // asm
+    // asm { lda#$55 eorvalue staSCREEN  }
+    lda #$55
+    eor value
+    sta SCREEN
+    // for(char i=0;i<10;i++)
+    // [10] (byte) main::i#1 ← ++ (byte) main::i#2 -- vbuxx=_inc_vbuxx 
+    inx
+    // [5] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
+    // [5] phi (byte) main::i#2 = (byte) main::i#1 [phi:main::@2->main::@1#0] -- register_copy 
+    jmp __b1
+}
+  // File Data
+
diff --git a/src/test/ref/inline-asm-ma-var.sym b/src/test/ref/inline-asm-ma-var.sym
new file mode 100644
index 000000000..0f53ae2f2
--- /dev/null
+++ b/src/test/ref/inline-asm-ma-var.sym
@@ -0,0 +1,15 @@
+(label) @1
+(label) @begin
+(label) @end
+(const nomodify byte*) SCREEN = (byte*) 1024
+(void()) main()
+(label) main::@1
+(label) main::@2
+(label) main::@return
+(byte) main::i
+(byte) main::i#1 reg byte x 202.0
+(byte) main::i#2 reg byte x 101.0
+(byte) main::value loadstore zp[1]:2 35.5
+
+reg byte x [ main::i#2 main::i#1 ]
+zp[1]:2 [ main::value ]