diff --git a/CHANGELOG.md b/CHANGELOG.md
index a671698..d7b3dce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 
 ## To Be Released...
 ## 5.X.Y
+* Fix: `Deus Ex` using the wrong protocol (#621)
 
 ## 5.1.2
 * Added Vintage Story support via the master server (#606)
diff --git a/lib/games.js b/lib/games.js
index 0084ffb..b32d3ea 100644
--- a/lib/games.js
+++ b/lib/games.js
@@ -930,7 +930,7 @@ export const games = {
     options: {
       port: 7791,
       port_query_offset: 1,
-      protocol: 'gamespy2'
+      protocol: 'gamespy1'
     }
   },
   devastation: {