1 files changed, 3 insertions, 2 deletions
diff --git a/Python/_warnings.c b/Python/_warnings.c
index dd168f9..37875e5 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -684,8 +684,9 @@ warnings_warn_explicit(PyObject *self, PyObject *args, PyObject *kwds)
         }
 
         /* Split the source into lines. */
-        source_list = PyObject_CallMethodObjArgs(source, splitlines_name,
-                                                    NULL);
+        source_list = PyObject_CallMethodObjArgs((PyObject *)&PyString_Type,
+                                                 splitlines_name, source,
+                                                 NULL);
         Py_DECREF(source);
         if (!source_list)
             return NULL;