diff --git a/zsnes/src/cpu/regs.inc b/zsnes/src/cpu/regs.inc
index c1e693b7..6eeb0cb9 100644
--- a/zsnes/src/cpu/regs.inc
+++ b/zsnes/src/cpu/regs.inc
@@ -1083,6 +1083,10 @@ reg43XXr:
 
 regINVALID:     ; Invalid Register
     mov al,ch
+    cmp byte[SPC7110Enable],0
+    je .nospc7110
+    xor al,al
+.nospc7110
     ret
 
     mov al,[previdmode]