diff --git a/Python/peephole.c b/Python/peephole.c
index c33bf1a..2b2e4c4 100644
--- a/Python/peephole.c
+++ b/Python/peephole.c
@@ -118,7 +118,7 @@
     /* If it's a BUILD_SET, use the PyTuple we just built to create a
       PyFrozenSet, and use that as the constant instead: */
     if (codestr[0] == BUILD_SET) {
-        Py_SETREF(newconst, PyFrozenSet_New(newconst));
+        Py_XSETREF(newconst, PyFrozenSet_New(newconst));
         if (newconst == NULL)
             return 0;
     }