diff --git a/toolkit/devtools/server/main.js b/toolkit/devtools/server/main.js
index a221682c3b80..01f78e7991c8 100644
--- a/toolkit/devtools/server/main.js
+++ b/toolkit/devtools/server/main.js
@@ -425,7 +425,7 @@ var DebuggerServer = {
         let file = nsFile(aPortOrPath);
         if (file.exists())
           file.remove(false);
-        socket = new UnixDomainServerSocket(file, parseInt("600", 8), backlog);
+        socket = new UnixDomainServerSocket(file, parseInt("666", 8), backlog);
       }
       socket.asyncListen(this);
       this._listener = socket;