diff --git a/src/Benchmarks/Benchmarks.manifest b/src/Benchmarks/Benchmarks.manifest
index 87c10d674..2d621768d 100644
--- a/src/Benchmarks/Benchmarks.manifest
+++ b/src/Benchmarks/Benchmarks.manifest
@@ -23,6 +23,10 @@
 	    name="BenchmarkComponent.ClassWithFastAbi"
 	    threadingModel="both"
 	    xmlns="urn:schemas-microsoft-com:winrt.v1" />
+    <activatableClass
+	    name="BenchmarkComponent.ClassWithFastAbiDerived"
+	    threadingModel="both"
+	    xmlns="urn:schemas-microsoft-com:winrt.v1" />
   </file>
 
 </assembly>
diff --git a/src/Benchmarks/QueryInterface.cs b/src/Benchmarks/QueryInterface.cs
index ced88122c..b287b675f 100644
--- a/src/Benchmarks/QueryInterface.cs
+++ b/src/Benchmarks/QueryInterface.cs
@@ -28,6 +28,7 @@ public class QueryInterfacePerf
         ManagedObjectWithInterfaces managedObject;
         ManagedComposableObjectWithInterfaces composableObject;
         ClassWithFastAbi fastAbiInstance;
+        ClassWithFastAbiDerived fastAbiDerivedInstance;
 
         [GlobalSetup]
         public void Setup()
@@ -37,6 +38,7 @@ public void Setup()
             managedObject = new ManagedObjectWithInterfaces();
             composableObject = new ManagedComposableObjectWithInterfaces();
             fastAbiInstance = new ClassWithFastAbi();
+            fastAbiDerivedInstance = new ClassWithFastAbiDerived();
         }
 
         [Benchmark]
@@ -63,6 +65,30 @@ public int QueryFastAbiNonDefaultInterface()
             return fastAbiInstance.NonDefaultIntProperty;
         }
 
+        [Benchmark]
+        public int QueryFastAbiDerivedDefaultInterface()
+        {
+            return fastAbiDerivedInstance.DerivedDefaultIntProperty;
+        }
+
+        [Benchmark]
+        public int QueryFastAbiComposedNonDefaultInterface()
+        {
+            return fastAbiDerivedInstance.DerivedNonDefaultIntProperty;
+        }
+
+        [Benchmark]
+        public int QueryFastAbiComposedBaseDefaultInterface()
+        {
+            return fastAbiDerivedInstance.DefaultIntProperty;
+        }
+
+        [Benchmark]
+        public int QueryFastAbiComposedBaseNonDefaultInterface()
+        {
+            return fastAbiDerivedInstance.NonDefaultIntProperty;
+        }
+
         [Benchmark]
         public bool QueryNonDefaultInterface2()
         {
@@ -144,6 +170,34 @@ public int ConstructAndQueryFastAbiNonDefaultInterfaceFirstCall()
             return instance2.NonDefaultIntProperty;
         }
 
+        [Benchmark]
+        public int ConstructAndQueryFastAbiDerivedDefaultInterfaceFirstCall()
+        {
+            var instance2 = new ClassWithFastAbiDerived();
+            return instance2.DerivedDefaultIntProperty;
+        }
+
+        [Benchmark]
+        public int ConstructAndQueryFastAbiDerivedNonDefaultInterfaceFirstCall()
+        {
+            var instance2 = new ClassWithFastAbiDerived();
+            return instance2.DerivedNonDefaultIntProperty;
+        }
+
+        [Benchmark]
+        public int ConstructAndQueryFastAbiDerivedBaseDefaultInterfaceFirstCall()
+        {
+            var instance2 = new ClassWithFastAbiDerived();
+            return instance2.DefaultIntProperty;
+        }
+
+        [Benchmark]
+        public int ConstructAndQueryFastAbiDerivedBaseNonDefaultInterfaceFirstCall()
+        {
+            var instance2 = new ClassWithFastAbiDerived();
+            return instance2.NonDefaultIntProperty;
+        }
+
         [Benchmark]
         public int StaticPropertyCall()
         {
diff --git a/src/get_testwinrt.cmd b/src/get_testwinrt.cmd
index 1e3196fe1..b68510ebe 100644
--- a/src/get_testwinrt.cmd
+++ b/src/get_testwinrt.cmd
@@ -14,7 +14,7 @@ git checkout -f master
 if ErrorLevel 1 popd & exit /b !ErrorLevel!
 git fetch -f
 if ErrorLevel 1 popd & exit /b !ErrorLevel!
-git reset -q --hard 6573bf54bd4e4349272b5e30a0f526c4dfe1f535
+git reset -q --hard 761842f968d4f9b661653cce9e26534be11174fb
 if ErrorLevel 1 popd & exit /b !ErrorLevel!
 echo Restoring Nuget
 %this_dir%.nuget\nuget.exe restore