diff --git a/osu.Game/Overlays/Mods/ModButton.cs b/osu.Game/Overlays/Mods/ModButton.cs
index 1d012b1288..f4e0e3db04 100644
--- a/osu.Game/Overlays/Mods/ModButton.cs
+++ b/osu.Game/Overlays/Mods/ModButton.cs
@@ -116,7 +116,7 @@ namespace osu.Game.Overlays.Mods
         }
 
         private Mod mod;
-        private Container scaleContainer;
+        private readonly Container scaleContainer;
 
         public Mod Mod
         {