diff -r 8960d8eb747b -r 675594a0a71a mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c	Tue Apr 06 03:24:26 2021 +0200
+++ b/mercurial/cext/revlog.c	Tue May 17 21:49:36 2022 +0400
@@ -497,7 +497,7 @@
 	if (self->format_version != format_v1) {
 		PyErr_Format(PyExc_RuntimeError,
 		             "version header should go in the docket, not the "
-		             "index: %lu",
+		             "index: %d",
 		             header);
 		return NULL;
 	}