diff --git a/src/main/fragment/mos6502-common/pbum1_derefidx_vbuyy=_dec_pbum1_derefidx_vbuyy.asm b/src/main/fragment/mos6502-common/pbum1_derefidx_vbuyy=_dec_pbum1_derefidx_vbuyy.asm
new file mode 100644
index 000000000..64142b47d
--- /dev/null
+++ b/src/main/fragment/mos6502-common/pbum1_derefidx_vbuyy=_dec_pbum1_derefidx_vbuyy.asm
@@ -0,0 +1,8 @@
+lda {m1}
+sta $fe
+lda {m1}+1
+sta $ff
+lda ($fe),y
+sec
+sbc #1
+sta ($fe),y
\ No newline at end of file