diff --git a/server/TetherController.cpp b/server/TetherController.cpp
index 6e805f5..06eaf94 100644
--- a/server/TetherController.cpp
+++ b/server/TetherController.cpp
@@ -630,6 +630,10 @@
     }
 
     std::vector<std::string> v4 = {
+        "*raw",
+        StringPrintf("%s %s -p tcp --dport 21 -i %s -j CT --helper ftp",
+                     op, LOCAL_RAW_PREROUTING, intIface),
+        "COMMIT",
         "*filter",
         StringPrintf("%s %s -i %s -o %s -m state --state ESTABLISHED,RELATED -g %s",
                      op, LOCAL_FORWARD, extIface, intIface, LOCAL_TETHER_COUNTERS_CHAIN),