diff --git a/Python/traceback.c b/Python/traceback.c
index cfbd833..04078b9 100644
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -250,7 +250,7 @@
 		return -1;
 	}
 	limitv = PySys_GetObject("tracebacklimit");
-	if (limitv && PyInt_Check(limitv)) {
+	if (limitv && PyInt_CheckExact(limitv)) {
 		limit = PyInt_AsLong(limitv);
 		if (limit <= 0)
 			return 0;