Fixing build

Change-Id: I61604a4ed7be7ab3151ae6e862dc4ef768c7b0cf
diff --git a/Dockerfile.xos-gui-extension-builder b/Dockerfile.xos-gui-extension-builder
index ea41050..f04fa3e 100644
--- a/Dockerfile.xos-gui-extension-builder
+++ b/Dockerfile.xos-gui-extension-builder
@@ -1,6 +1,6 @@
 # To build use: docker build -t xosproject/xos-gui-extension-builder .
 
-FROM node:argon
+FROM node:7.9.0
 
 # Set environment vars
 ENV CODE_SOURCE .