diff --git a/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs b/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs
index ba77dc273a..1aa414d505 100644
--- a/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs
+++ b/Content.Client/UserInterface/Systems/Chat/ChatUIController.cs
@@ -293,7 +293,8 @@ public sealed class ChatUIController : UIController
             throw new Exception("Cannot get active screen!");
         }
 
-        var stringSize = $"{size.X},{size.Y}";
+        var stringSize =
+            $"{size.X.ToString(CultureInfo.InvariantCulture)},{size.Y.ToString(CultureInfo.InvariantCulture)}";
         switch (UIManager.ActiveScreen)
         {
             case DefaultGameScreen _: