diff --git a/build/deploy-ftp.sh b/build/deploy-ftp.sh
index 44616103..3cb1f634 100644
--- a/build/deploy-ftp.sh
+++ b/build/deploy-ftp.sh
@@ -22,7 +22,7 @@ chmod 600 "$NETRC"
 echo "Deploying as $USER at $HOST"
 
 ftp "$HOST" <<EOF
-passive
+passive on
 type image
 cd $DIR
 lcd out