diff --git a/src/main/fragment/mos6502-common/vbuaa=pbuz1_derefidx_vbuyy_minus_1.asm b/src/main/fragment/mos6502-common/vbuaa=pbuz1_derefidx_vbuyy_minus_1.asm
new file mode 100644
index 000000000..034f3d5ef
--- /dev/null
+++ b/src/main/fragment/mos6502-common/vbuaa=pbuz1_derefidx_vbuyy_minus_1.asm
@@ -0,0 +1,3 @@
+sec
+lda ({z1}),y
+sbc #1