diff --git a/c64/kernal/cartridge_check.s b/c64/kernal/cartridge_check.s
index 8dabdcd7..de748d4e 100644
--- a/c64/kernal/cartridge_check.s
+++ b/c64/kernal/cartridge_check.s
@@ -11,3 +11,5 @@ cartridge_check_l1:
 	jmp ($8000)
 cartridge_signature:
 	.byte $C3,$C2,$CD,$38,$30
+no_cartridge:
+	rts