1 files changed, 2 insertions, 1 deletions
diff --git a/eval.c b/eval.c
index 0057624011..f886db1215 100644
--- a/eval.c
+++ b/eval.c
@@ -6165,7 +6165,8 @@ method_arity(method)
 	    body = body->nd_head;
 	if (!body) return INT2FIX(0);
 	n = body->nd_cnt;
-	if (body->nd_rest >= 0) n = -n-1;
+	if (body->nd_opt || body->nd_rest >= 0)
+	    n = -n-1;
 	return INT2FIX(n);
     }
 }