diff -r acd23830bcd6 -r b935adb4b041 mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c	Fri Aug 10 00:14:47 2018 -0400
+++ b/mercurial/cext/revlog.c	Fri Aug 10 00:28:07 2018 -0400
@@ -2005,7 +2005,7 @@
 		self->cache = NULL;
 	}
 	if (self->offsets) {
-		PyMem_Free(self->offsets);
+		PyMem_Free((void *)self->offsets);
 		self->offsets = NULL;
 	}
 	if (self->nt != NULL) {