1 files changed, 1 insertions, 2 deletions
diff --git a/Python/_warnings.c b/Python/_warnings.c
index 92d6547a7c..8e8c0cceb3 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -528,8 +528,7 @@ setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno,
                     goto handle_error;
                 }
                 else if (!is_true) {
-                    Py_DECREF(*filename);
-                    *filename = PyString_FromString("__main__");
+                    Py_SETREF(*filename, PyString_FromString("__main__"));
                     if (*filename == NULL)
                         goto handle_error;
                 }