diff --git a/osu.Game/Extensions/TypeExtensions.cs b/osu.Game/Extensions/TypeExtensions.cs
index 2e93c81758..072b18b0ba 100644
--- a/osu.Game/Extensions/TypeExtensions.cs
+++ b/osu.Game/Extensions/TypeExtensions.cs
@@ -21,7 +21,7 @@ namespace osu.Game.Extensions
         /// </remarks>
         internal static string GetInvariantInstantiationInfo(this Type type)
         {
-            string assemblyQualifiedName = type.AssemblyQualifiedName;
+            string? assemblyQualifiedName = type.AssemblyQualifiedName;
             if (assemblyQualifiedName == null)
                 throw new ArgumentException($"{type}'s assembly-qualified name is null. Ensure that it is a concrete type and not a generic type parameter.", nameof(type));