diff --git a/Python/getargs.c b/Python/getargs.c
index a6cebbc..81a2721 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -1837,6 +1837,7 @@
     assert(min >= 0);
     assert(min <= max);
     if (!PyTuple_Check(args)) {
+        va_end(vargs);
         PyErr_SetString(PyExc_SystemError,
             "PyArg_UnpackTuple() argument list is not a tuple");
         return 0;