diff --git a/eval.c b/eval.c
index e6a695581f..55e5dd6f1d 100644
--- a/eval.c
+++ b/eval.c
@@ -1815,6 +1815,8 @@ is_defined(self, node, buf)
 		    !rb_obj_is_kind_of(self, rb_class_real(val)))
 		    break;
 	    }
+	    else if (!rb_method_boundp(val, node->nd_mid, call))
+		break;
 	    return arg_defined(self, node->nd_args, buf, "method");
 	}
 	break;