diff --git a/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs b/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs
index b22dd086174b..29ba80aacf0b 100644
--- a/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs
+++ b/src/System.Runtime.Loader/ref/System.Runtime.Loader.cs
@@ -33,5 +33,6 @@ public static void InitializeDefaultContext(System.Runtime.Loader.AssemblyLoadCo
         public void SetProfileOptimizationRoot(string directoryPath) { }
         public void StartProfileOptimization(string profile) { }
         public event Func<AssemblyLoadContext, System.Reflection.AssemblyName, System.Reflection.Assembly> Resolving;
+        public event System.EventHandler Unloading;
     }
 }