diff --git a/src/main/fragment/mos6502-common/vbsaa=vbsc1_minus_vbsaa.asm b/src/main/fragment/mos6502-common/vbsaa=vbsc1_minus_vbsaa.asm
index a6874404c..5fb489b8d 100644
--- a/src/main/fragment/mos6502-common/vbsaa=vbsc1_minus_vbsaa.asm
+++ b/src/main/fragment/mos6502-common/vbsaa=vbsc1_minus_vbsaa.asm
@@ -1,3 +1,3 @@
 eor #$ff
-clc
-adc #{c1}+1
\ No newline at end of file
+sec
+adc #{c1}
\ No newline at end of file
diff --git a/src/main/fragment/mos6502-common/vbsaa=vbuc1_minus_vbsaa.asm b/src/main/fragment/mos6502-common/vbsaa=vbuc1_minus_vbsaa.asm
index a6874404c..5fb489b8d 100644
--- a/src/main/fragment/mos6502-common/vbsaa=vbuc1_minus_vbsaa.asm
+++ b/src/main/fragment/mos6502-common/vbsaa=vbuc1_minus_vbsaa.asm
@@ -1,3 +1,3 @@
 eor #$ff
-clc
-adc #{c1}+1
\ No newline at end of file
+sec
+adc #{c1}
\ No newline at end of file