diff --git a/Python/ast.c b/Python/ast.c
index 46815c2..e6f7167 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -630,6 +630,7 @@
         PyObject *args[2] = {form, id};
         id2 = _PyObject_FastCall(c->c_normalize, args, 2);
         Py_DECREF(id);
+        Py_DECREF(form);
         if (!id2)
             return NULL;
         if (!PyUnicode_Check(id2)) {