1 files changed, 4 insertions, 3 deletions
diff --git a/enum.c b/enum.c
index 875beb9eaf..c1efb1b5c2 100644
--- a/enum.c
+++ b/enum.c
@@ -149,9 +149,10 @@ enum_count(int argc, VALUE *argv, VALUE obj)
 	    func = count_iter_i;
 	}
 	else {
-	    if (rb_respond_to(obj, id_size)) {
-		return rb_funcall(obj, id_size, 0, 0);
-	    }
+	    VALUE tmp;
+
+	    tmp = rb_check_funcall(obj, id_size, 0, 0);
+	    if (tmp != Qundef) return tmp;
 	    func = count_all_i;
 	}
     }