diff --git a/lib/evaluator.c b/lib/evaluator.c
index 53bb7dd..28eed36 100644
--- a/lib/evaluator.c
+++ b/lib/evaluator.c
@@ -16,6 +16,6 @@ int evaluate(const expression_t *expression)
 	case OPERATOR_DIVIDE:
 		return x / y;
 	default:
-		return -1;
+		return 0xdead;
 	}
 }