diff --git a/server/TetherController.cpp b/server/TetherController.cpp
index 06eaf94..61ac8c5 100644
--- a/server/TetherController.cpp
+++ b/server/TetherController.cpp
@@ -633,6 +633,8 @@
         "*raw",
         StringPrintf("%s %s -p tcp --dport 21 -i %s -j CT --helper ftp",
                      op, LOCAL_RAW_PREROUTING, intIface),
+        StringPrintf("%s %s -p tcp --dport 1723 -i %s -j CT --helper pptp",
+                     op, LOCAL_RAW_PREROUTING, intIface),
         "COMMIT",
         "*filter",
         StringPrintf("%s %s -i %s -o %s -m state --state ESTABLISHED,RELATED -g %s",