diff --git a/packages/server/src/main.js b/packages/server/src/main.js
index aa8b964..2be89a2 100644
--- a/packages/server/src/main.js
+++ b/packages/server/src/main.js
@@ -31,7 +31,7 @@ let data = {};
  */
 function createGuid()
 {
-    return randexp(/[0-9a-f]{8}(-[0-9a-f]){4}[0-9a-f]{8}/);
+    return randexp(/[0-9a-f]{8}(-[0-9a-f]{4}){4}[0-9a-f]{8}/);
 }
 
 app.use(express.static(join(dirname, "..", "..", "game", "lib", "static")));