diff --git a/Python/ceval.c b/Python/ceval.c
index 28360f4..0527537 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -2745,8 +2745,9 @@
 						callable, args);
 					Py_DECREF(args);
 				}
-				if (callable != basetype)
+				if (callable != basetype) {
 					Py_DECREF(callable);
+				}
 				return newclass;
 			}
 			PyErr_SetString(PyExc_TypeError,