diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 643cbde317b..245d4f63168 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -2715,7 +2715,7 @@ static PyObject *
 test_incref_decref_API(PyObject *ob)
 {
     PyObject *obj = PyLong_FromLong(0);
-    Py_IncRef(ob);
+    Py_IncRef(obj);
     Py_DecRef(obj);
     Py_DecRef(obj);
     Py_RETURN_NONE;