diff --git a/mapserver_mod b/mapserver_mod
index ad4e151..b4ffb0a 160000
--- a/mapserver_mod
+++ b/mapserver_mod
@@ -1 +1 @@
-Subproject commit ad4e151184bc4abb3087b8fd45377accc88c0114
+Subproject commit b4ffb0a0587bae989adf476ac8d44091659cfd55