1 files changed, 3 insertions, 1 deletions
diff --git a/class.c b/class.c
index a172ae6611..32a35662bb 100644
--- a/class.c
+++ b/class.c
@@ -731,10 +731,12 @@ rb_obj_singleton_methods(int argc, VALUE *argv, VALUE obj)
     VALUE recur, ary, klass;
     st_table *list;
 
-    rb_scan_args(argc, argv, "01", &recur);
     if (argc == 0) {
 	recur = Qtrue;
     }
+    else {
+	rb_scan_args(argc, argv, "01", &recur);
+    }
     klass = CLASS_OF(obj);
     list = st_init_numtable();
     if (klass && FL_TEST(klass, FL_SINGLETON)) {