diff --git a/src/main/fragment/pwsc1_derefidx_vbuxx=pwsc1_derefidx_vbuxx_minus_vbuz1.asm b/src/main/fragment/pwsc1_derefidx_vbuxx=pwsc1_derefidx_vbuxx_minus_vbuz1.asm
new file mode 100644
index 000000000..971c9734e
--- /dev/null
+++ b/src/main/fragment/pwsc1_derefidx_vbuxx=pwsc1_derefidx_vbuxx_minus_vbuz1.asm
@@ -0,0 +1,7 @@
+sec
+lda {c1},x
+sbc {z1}
+sta {c1},x
+lda {c1}+1,x
+sbc #0
+sta {c1}+1,x
\ No newline at end of file
diff --git a/src/main/fragment/pwsc1_derefidx_vbuyy=pwsc1_derefidx_vbuyy_minus_vbuz1.asm b/src/main/fragment/pwsc1_derefidx_vbuyy=pwsc1_derefidx_vbuyy_minus_vbuz1.asm
new file mode 100644
index 000000000..4ec0cf66e
--- /dev/null
+++ b/src/main/fragment/pwsc1_derefidx_vbuyy=pwsc1_derefidx_vbuyy_minus_vbuz1.asm
@@ -0,0 +1,7 @@
+sec
+lda {c1},y
+sbc {z1}
+sta {c1},y
+lda {c1}+1,y
+sbc #0
+sta {c1}+1,y
\ No newline at end of file
diff --git a/src/test/java/dk/camelot64/kickc/test/TestFragments.java b/src/test/java/dk/camelot64/kickc/test/TestFragments.java
index 33d1787a6..a6a5a4628 100644
--- a/src/test/java/dk/camelot64/kickc/test/TestFragments.java
+++ b/src/test/java/dk/camelot64/kickc/test/TestFragments.java
@@ -141,6 +141,8 @@ public class TestFragments {
       testFragmentExists("pwsc1_derefidx_vbuyy=vwsc2");
       testFragmentExists("pwsc1_derefidx_vbuxx=pwsc1_derefidx_vbuxx_minus_vbuc2");
       testFragmentExists("pwsc1_derefidx_vbuyy=pwsc1_derefidx_vbuyy_minus_vbuc2");
+      testFragmentExists("pwsc1_derefidx_vbuxx=pwsc1_derefidx_vbuxx_minus_vbuz1");
+      testFragmentExists("pwsc1_derefidx_vbuyy=pwsc1_derefidx_vbuyy_minus_vbuz1");
    }
 
    /**