diff --git a/gitdb/ext/smmap b/gitdb/ext/smmap
index 256c5a2..f1ace75 160000
--- a/gitdb/ext/smmap
+++ b/gitdb/ext/smmap
@@ -1 +1 @@
-Subproject commit 256c5a21de2d14aca02c9689d7d63f78c4e0ef61
+Subproject commit f1ace75be355fdec927793e462b9b12bf6ec9520