diff --git a/CodeAnalysis/osu.ruleset b/CodeAnalysis/osu.ruleset
index 2a0c6fb928..0756adb05c 100644
--- a/CodeAnalysis/osu.ruleset
+++ b/CodeAnalysis/osu.ruleset
@@ -9,7 +9,6 @@
     <Rule Id="CA1040" Action="None" />
     <Rule Id="CA1044" Action="None" />
     <Rule Id="CA1051" Action="None" />
-    <Rule Id="CA1052" Action="None" />
     <Rule Id="CA1054" Action="None" />
     <Rule Id="CA1056" Action="None" />
     <Rule Id="CA1062" Action="None" />
diff --git a/osu.Game/IO/Legacy/SerializationReader.cs b/osu.Game/IO/Legacy/SerializationReader.cs
index 82b2c4be32..aeb3ce754d 100644
--- a/osu.Game/IO/Legacy/SerializationReader.cs
+++ b/osu.Game/IO/Legacy/SerializationReader.cs
@@ -192,7 +192,7 @@ public object ReadObject()
             }
         }
 
-        public class DynamicDeserializer
+        public static class DynamicDeserializer
         {
             private static VersionConfigToNamespaceAssemblyObjectBinder versionBinder;
             private static BinaryFormatter formatter;