1 files changed, 1 insertions, 1 deletions
diff --git a/signal.c b/signal.c
index 02c8393730..631fdae4e0 100644
--- a/signal.c
+++ b/signal.c
@@ -391,7 +391,7 @@ interrupt_init(int argc, VALUE *argv, VALUE self)
     VALUE args[2];
 
     args[0] = INT2FIX(SIGINT);
-    rb_scan_args(argc, argv, "01", &args[1]);
+    args[1] = rb_check_arity(argc, 0, 1) ? argv[0] : Qnil;
     return rb_call_super(2, args);
 }