diff --git a/gitdb/ext/smmap b/gitdb/ext/smmap
index 334ef84..f1ace75 160000
--- a/gitdb/ext/smmap
+++ b/gitdb/ext/smmap
@@ -1 +1 @@
-Subproject commit 334ef84a05c953ed5dbec7b9c6d4310879eeab5a
+Subproject commit f1ace75be355fdec927793e462b9b12bf6ec9520