diff --git a/src/main/java/dk/camelot64/kickc/model/symbols/Procedure.java b/src/main/java/dk/camelot64/kickc/model/symbols/Procedure.java
index 77d545bed..ec9b6d930 100644
--- a/src/main/java/dk/camelot64/kickc/model/symbols/Procedure.java
+++ b/src/main/java/dk/camelot64/kickc/model/symbols/Procedure.java
@@ -100,8 +100,14 @@ public class Procedure extends Scope {
       HARDWARE_ALL,
       /** Interrupt served directly from hardware through $fffe-f. Will exit through RTI and will save necessary registers based on clobber. */
       HARDWARE_CLOBBER
+      ;
+
+      /** The default interrupt type if none is explicitly declared (KERNEL_MIN). */
+      public static InterruptType DEFAULT = InterruptType.KERNEL_MIN;
+
    }
 
+
    @Override
    public String toString() {
       return toString(null);
diff --git a/src/main/java/dk/camelot64/kickc/passes/Pass0GenerateStatementSequence.java b/src/main/java/dk/camelot64/kickc/passes/Pass0GenerateStatementSequence.java
index 72945e58e..d59fd7e4a 100644
--- a/src/main/java/dk/camelot64/kickc/passes/Pass0GenerateStatementSequence.java
+++ b/src/main/java/dk/camelot64/kickc/passes/Pass0GenerateStatementSequence.java
@@ -410,9 +410,12 @@ public class Pass0GenerateStatementSequence extends KickCBaseVisitor<Object> {
 
    @Override
    public Object visitDirectiveInterrupt(KickCParser.DirectiveInterruptContext ctx) {
-      String interruptType = "KERNEL_MIN";
+      String interruptType;
       if(ctx.getChildCount() > 1) {
          interruptType = ctx.getChild(2).getText().toUpperCase();
+      } else {
+         // The default interrupt type
+         interruptType = Procedure.InterruptType.DEFAULT.name();
       }
       Procedure.InterruptType type = Procedure.InterruptType.valueOf(interruptType);
       return new DirectiveInterrupt(type);
diff --git a/src/test/java/dk/camelot64/kickc/test/TestPrograms.java b/src/test/java/dk/camelot64/kickc/test/TestPrograms.java
index f4175741b..ad15be343 100644
--- a/src/test/java/dk/camelot64/kickc/test/TestPrograms.java
+++ b/src/test/java/dk/camelot64/kickc/test/TestPrograms.java
@@ -132,6 +132,11 @@ public class TestPrograms {
       compileAndCompare("test-interrupt");
    }
 
+   @Test
+   public void testInterruptNoType() throws IOException, URISyntaxException {
+      compileAndCompare("test-interrupt-notype");
+   }
+
    @Test
    public void testMultiplexer() throws IOException, URISyntaxException {
       compileAndCompare("simple-multiplexer", 10);
diff --git a/src/test/java/dk/camelot64/kickc/test/kc/test-interrupt-notype.kc b/src/test/java/dk/camelot64/kickc/test/kc/test-interrupt-notype.kc
new file mode 100644
index 000000000..da3493fae
--- /dev/null
+++ b/src/test/java/dk/camelot64/kickc/test/kc/test-interrupt-notype.kc
@@ -0,0 +1,17 @@
+const void()** KERNEL_IRQ = $0314;
+const byte* BGCOL = $d020;
+const byte* FGCOL = $d021;
+
+void main() {
+    *KERNEL_IRQ = &irq;
+    while(true) {
+        (*FGCOL)++;
+    }
+}
+
+interrupt void irq() {
+    (*BGCOL)++;
+    asm {
+        lda $dc0d
+    }
+}
diff --git a/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.asm b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.asm
new file mode 100644
index 000000000..948b5dd6c
--- /dev/null
+++ b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.asm
@@ -0,0 +1,21 @@
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+  .label KERNEL_IRQ = $314
+  .label BGCOL = $d020
+  .label FGCOL = $d021
+  jsr main
+main: {
+    lda #<irq
+    sta KERNEL_IRQ
+    lda #>irq
+    sta KERNEL_IRQ+1
+  b2:
+    inc FGCOL
+    jmp b2
+}
+irq: {
+    inc BGCOL
+    lda $dc0d
+    jmp $ea81
+}
diff --git a/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.cfg b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.cfg
new file mode 100644
index 000000000..4601ca983
--- /dev/null
+++ b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.cfg
@@ -0,0 +1,22 @@
+@begin: scope:[]  from
+  [0] phi() [ ] ( )
+  to:@2
+@2: scope:[]  from @begin
+  [1] phi() [ ] ( )
+  [2] call main  [ ] ( )
+  to:@end
+@end: scope:[]  from @2
+  [3] phi() [ ] ( )
+main: scope:[main]  from @2
+  [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() [ ] ( main:2 [ ] )
+  to:main::@2
+main::@2: scope:[main]  from main main::@2
+  [5] *((const byte*) FGCOL#0) ← ++ *((const byte*) FGCOL#0) [ ] ( main:2 [ ] )
+  to:main::@2
+irq: scope:[irq]  from
+  [6] *((const byte*) BGCOL#0) ← ++ *((const byte*) BGCOL#0) [ ] ( )
+  asm { lda$dc0d  }
+  to:irq::@return
+irq::@return: scope:[irq]  from irq
+  [8] return  [ ] ( )
+  to:@return
diff --git a/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.log b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.log
new file mode 100644
index 000000000..a93169989
--- /dev/null
+++ b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.log
@@ -0,0 +1,306 @@
+Resolved forward reference irq to interrupt(KERNEL_MIN)(void()) irq()
+
+CONTROL FLOW GRAPH SSA
+@begin: scope:[]  from
+  (void()**) KERNEL_IRQ#0 ← ((void()**)) (word/signed word/dword/signed dword) 788
+  (byte*) BGCOL#0 ← ((byte*)) (word/dword/signed dword) 53280
+  (byte*) FGCOL#0 ← ((byte*)) (word/dword/signed dword) 53281
+  to:@2
+main: scope:[main]  from @2
+  (void()*~) main::$0 ← & interrupt(KERNEL_MIN)(void()) irq()
+  *((void()**) KERNEL_IRQ#0) ← (void()*~) main::$0
+  to:main::@1
+main::@1: scope:[main]  from main main::@2
+  if(true) goto main::@2
+  to:main::@return
+main::@2: scope:[main]  from main::@1
+  *((byte*) FGCOL#0) ← ++ *((byte*) FGCOL#0)
+  to:main::@1
+main::@return: scope:[main]  from main::@1
+  return 
+  to:@return
+irq: scope:[irq]  from
+  *((byte*) BGCOL#0) ← ++ *((byte*) BGCOL#0)
+  asm { lda$dc0d  }
+  to:irq::@return
+irq::@return: scope:[irq]  from irq
+  return 
+  to:@return
+@2: scope:[]  from @begin
+  call main 
+  to:@3
+@3: scope:[]  from @2
+  to:@end
+@end: scope:[]  from @3
+
+SYMBOL TABLE SSA
+(label) @2
+(label) @3
+(label) @begin
+(label) @end
+(byte*) BGCOL
+(byte*) BGCOL#0
+(byte*) FGCOL
+(byte*) FGCOL#0
+(void()**) KERNEL_IRQ
+(void()**) KERNEL_IRQ#0
+interrupt(KERNEL_MIN)(void()) irq()
+(label) irq::@return
+(void()) main()
+(void()*~) main::$0
+(label) main::@1
+(label) main::@2
+(label) main::@return
+
+Culled Empty Block (label) @3
+Successful SSA optimization Pass2CullEmptyBlocks
+Constant (const void()**) KERNEL_IRQ#0 = ((void()**))788
+Constant (const byte*) BGCOL#0 = ((byte*))53280
+Constant (const byte*) FGCOL#0 = ((byte*))53281
+Constant (const void()*) main::$0 = &irq
+Successful SSA optimization Pass2ConstantIdentification
+if() condition always true - replacing block destination if(true) goto main::@2
+Successful SSA optimization Pass2ConstantIfs
+Removing unused block main::@return
+Successful SSA optimization Pass2EliminateUnusedBlocks
+Culled Empty Block (label) main::@1
+Successful SSA optimization Pass2CullEmptyBlocks
+Constant inlined main::$0 = &interrupt(KERNEL_MIN)(void()) irq()
+Successful SSA optimization Pass2ConstantInlining
+Adding NOP phi() at start of @begin
+Adding NOP phi() at start of @2
+Adding NOP phi() at start of @end
+CALL GRAPH
+Calls in [] to main:2 
+
+Created 0 initial phi equivalence classes
+Coalesced down to 0 phi equivalence classes
+Adding NOP phi() at start of @begin
+Adding NOP phi() at start of @2
+Adding NOP phi() at start of @end
+
+FINAL CONTROL FLOW GRAPH
+@begin: scope:[]  from
+  [0] phi() [ ] ( )
+  to:@2
+@2: scope:[]  from @begin
+  [1] phi() [ ] ( )
+  [2] call main  [ ] ( )
+  to:@end
+@end: scope:[]  from @2
+  [3] phi() [ ] ( )
+main: scope:[main]  from @2
+  [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() [ ] ( main:2 [ ] )
+  to:main::@2
+main::@2: scope:[main]  from main main::@2
+  [5] *((const byte*) FGCOL#0) ← ++ *((const byte*) FGCOL#0) [ ] ( main:2 [ ] )
+  to:main::@2
+irq: scope:[irq]  from
+  [6] *((const byte*) BGCOL#0) ← ++ *((const byte*) BGCOL#0) [ ] ( )
+  asm { lda$dc0d  }
+  to:irq::@return
+irq::@return: scope:[irq]  from irq
+  [8] return  [ ] ( )
+  to:@return
+
+
+VARIABLE REGISTER WEIGHTS
+(byte*) BGCOL
+(byte*) FGCOL
+(void()**) KERNEL_IRQ
+interrupt(KERNEL_MIN)(void()) irq()
+(void()) main()
+
+Initial phi equivalence classes
+Complete equivalence classes
+
+INITIAL ASM
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .label KERNEL_IRQ = $314
+  .label BGCOL = $d020
+  .label FGCOL = $d021
+//SEG2 @begin
+bbegin:
+//SEG3 [1] phi from @begin to @2 [phi:@begin->@2]
+b2_from_bbegin:
+  jmp b2
+//SEG4 @2
+b2:
+//SEG5 [2] call main  [ ] ( )
+  jsr main
+//SEG6 [3] phi from @2 to @end [phi:@2->@end]
+bend_from_b2:
+  jmp bend
+//SEG7 @end
+bend:
+//SEG8 main
+main: {
+  //SEG9 [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() [ ] ( main:2 [ ] ) -- _deref_pptc1=pprc2 
+    lda #<irq
+    sta KERNEL_IRQ
+    lda #>irq
+    sta KERNEL_IRQ+1
+    jmp b2
+  //SEG10 main::@2
+  b2:
+  //SEG11 [5] *((const byte*) FGCOL#0) ← ++ *((const byte*) FGCOL#0) [ ] ( main:2 [ ] ) -- _deref_pbuc1=_inc__deref_pbuc1 
+    inc FGCOL
+    jmp b2
+}
+//SEG12 irq
+irq: {
+  //SEG13 entry interrupt(KERNEL_MIN)
+  //SEG14 [6] *((const byte*) BGCOL#0) ← ++ *((const byte*) BGCOL#0) [ ] ( ) -- _deref_pbuc1=_inc__deref_pbuc1 
+    inc BGCOL
+  //SEG15 asm { lda$dc0d  }
+    lda $dc0d
+    jmp breturn
+  //SEG16 irq::@return
+  breturn:
+  //SEG17 [8] return  [ ] ( ) - exit interrupt(KERNEL_MIN)
+    jmp $ea81
+}
+
+REGISTER UPLIFT POTENTIAL REGISTERS
+Statement [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() [ ] ( main:2 [ ] ) always clobbers reg byte a 
+Statement asm { lda$dc0d  } always clobbers reg byte a 
+
+REGISTER UPLIFT SCOPES
+Uplift Scope [main] 
+Uplift Scope [irq] 
+Uplift Scope [] 
+
+Uplifting [main] best 133 combination 
+Uplifting [irq] best 133 combination 
+Uplifting [] best 133 combination 
+
+ASSEMBLER BEFORE OPTIMIZATION
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .label KERNEL_IRQ = $314
+  .label BGCOL = $d020
+  .label FGCOL = $d021
+//SEG2 @begin
+bbegin:
+//SEG3 [1] phi from @begin to @2 [phi:@begin->@2]
+b2_from_bbegin:
+  jmp b2
+//SEG4 @2
+b2:
+//SEG5 [2] call main  [ ] ( )
+  jsr main
+//SEG6 [3] phi from @2 to @end [phi:@2->@end]
+bend_from_b2:
+  jmp bend
+//SEG7 @end
+bend:
+//SEG8 main
+main: {
+  //SEG9 [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() [ ] ( main:2 [ ] ) -- _deref_pptc1=pprc2 
+    lda #<irq
+    sta KERNEL_IRQ
+    lda #>irq
+    sta KERNEL_IRQ+1
+    jmp b2
+  //SEG10 main::@2
+  b2:
+  //SEG11 [5] *((const byte*) FGCOL#0) ← ++ *((const byte*) FGCOL#0) [ ] ( main:2 [ ] ) -- _deref_pbuc1=_inc__deref_pbuc1 
+    inc FGCOL
+    jmp b2
+}
+//SEG12 irq
+irq: {
+  //SEG13 entry interrupt(KERNEL_MIN)
+  //SEG14 [6] *((const byte*) BGCOL#0) ← ++ *((const byte*) BGCOL#0) [ ] ( ) -- _deref_pbuc1=_inc__deref_pbuc1 
+    inc BGCOL
+  //SEG15 asm { lda$dc0d  }
+    lda $dc0d
+    jmp breturn
+  //SEG16 irq::@return
+  breturn:
+  //SEG17 [8] return  [ ] ( ) - exit interrupt(KERNEL_MIN)
+    jmp $ea81
+}
+
+ASSEMBLER OPTIMIZATIONS
+Removing instruction jmp b2
+Removing instruction jmp bend
+Removing instruction jmp b2
+Removing instruction jmp breturn
+Succesful ASM optimization Pass5NextJumpElimination
+Removing instruction bbegin:
+Removing instruction b2_from_bbegin:
+Removing instruction bend_from_b2:
+Succesful ASM optimization Pass5RedundantLabelElimination
+Removing instruction b2:
+Removing instruction bend:
+Removing instruction breturn:
+Succesful ASM optimization Pass5UnusedLabelElimination
+
+FINAL SYMBOL TABLE
+(label) @2
+(label) @begin
+(label) @end
+(byte*) BGCOL
+(const byte*) BGCOL#0 BGCOL = ((byte*))(word/dword/signed dword) 53280
+(byte*) FGCOL
+(const byte*) FGCOL#0 FGCOL = ((byte*))(word/dword/signed dword) 53281
+(void()**) KERNEL_IRQ
+(const void()**) KERNEL_IRQ#0 KERNEL_IRQ = ((void()**))(word/signed word/dword/signed dword) 788
+interrupt(KERNEL_MIN)(void()) irq()
+(label) irq::@return
+(void()) main()
+(label) main::@2
+
+
+
+FINAL ASSEMBLER
+Score: 121
+
+//SEG0 Basic Upstart
+.pc = $801 "Basic"
+:BasicUpstart(main)
+.pc = $80d "Program"
+//SEG1 Global Constants & labels
+  .label KERNEL_IRQ = $314
+  .label BGCOL = $d020
+  .label FGCOL = $d021
+//SEG2 @begin
+//SEG3 [1] phi from @begin to @2 [phi:@begin->@2]
+//SEG4 @2
+//SEG5 [2] call main  [ ] ( )
+  jsr main
+//SEG6 [3] phi from @2 to @end [phi:@2->@end]
+//SEG7 @end
+//SEG8 main
+main: {
+  //SEG9 [4] *((const void()**) KERNEL_IRQ#0) ← &interrupt(KERNEL_MIN)(void()) irq() [ ] ( main:2 [ ] ) -- _deref_pptc1=pprc2 
+    lda #<irq
+    sta KERNEL_IRQ
+    lda #>irq
+    sta KERNEL_IRQ+1
+  //SEG10 main::@2
+  b2:
+  //SEG11 [5] *((const byte*) FGCOL#0) ← ++ *((const byte*) FGCOL#0) [ ] ( main:2 [ ] ) -- _deref_pbuc1=_inc__deref_pbuc1 
+    inc FGCOL
+    jmp b2
+}
+//SEG12 irq
+irq: {
+  //SEG13 entry interrupt(KERNEL_MIN)
+  //SEG14 [6] *((const byte*) BGCOL#0) ← ++ *((const byte*) BGCOL#0) [ ] ( ) -- _deref_pbuc1=_inc__deref_pbuc1 
+    inc BGCOL
+  //SEG15 asm { lda$dc0d  }
+    lda $dc0d
+  //SEG16 irq::@return
+  //SEG17 [8] return  [ ] ( ) - exit interrupt(KERNEL_MIN)
+    jmp $ea81
+}
+
diff --git a/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.sym b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.sym
new file mode 100644
index 000000000..536f88f86
--- /dev/null
+++ b/src/test/java/dk/camelot64/kickc/test/ref/test-interrupt-notype.sym
@@ -0,0 +1,14 @@
+(label) @2
+(label) @begin
+(label) @end
+(byte*) BGCOL
+(const byte*) BGCOL#0 BGCOL = ((byte*))(word/dword/signed dword) 53280
+(byte*) FGCOL
+(const byte*) FGCOL#0 FGCOL = ((byte*))(word/dword/signed dword) 53281
+(void()**) KERNEL_IRQ
+(const void()**) KERNEL_IRQ#0 KERNEL_IRQ = ((void()**))(word/signed word/dword/signed dword) 788
+interrupt(KERNEL_MIN)(void()) irq()
+(label) irq::@return
+(void()) main()
+(label) main::@2
+