diff --git a/InstructionSets/M68k/Instruction.cpp b/InstructionSets/M68k/Instruction.cpp
index e41d0b118..dfd09c4fd 100644
--- a/InstructionSets/M68k/Instruction.cpp
+++ b/InstructionSets/M68k/Instruction.cpp
@@ -245,6 +245,7 @@ const char *_to_string(Operation operation, bool is_quick) {
 
 		default:
 			assert(false);
+			return "???";
 	}
 }