diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index c4b4902..6164510 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -2321,7 +2321,7 @@
         if (unicode_decode_call_errorhandler(
                 errors, &errorHandler,
                 "utf32", errmsg,
-                starts, size, &startinpos, &endinpos, &exc, &s,
+                starts, size, &startinpos, &endinpos, &exc, (const char **)&q,
                 &unicode, &outpos, &p))
             goto onError;
     }