diff --git a/dockering/ib/run_x11_vnc.sh b/dockering/ib/run_x11_vnc.sh
index 64197898..aa057a69 100755
--- a/dockering/ib/run_x11_vnc.sh
+++ b/dockering/ib/run_x11_vnc.sh
@@ -2,6 +2,7 @@
 
 x11vnc \
     -ncache_cr \
+    -listen localhost \
     -display :1 \
     -forever \
     -shared \