diff --git a/novnc/Dockerfile b/novnc/Dockerfile
index 2602bf5..65a7842 100644
--- a/novnc/Dockerfile
+++ b/novnc/Dockerfile
@@ -1,7 +1,10 @@
 # syntax = docker/dockerfile:1
-FROM myvnc/base
+FROM myvnc/alpine/base
 USER root
 
+# Exempt from image pruning
+LABEL prune="do_not_delete"
+
 # Build ARG: use "root" for debugging
 ARG debug