diff --git a/dev/WindowsAppRuntime_DLL/WindowsAppRuntime.def b/dev/WindowsAppRuntime_DLL/WindowsAppRuntime.def
index de435f0404..c487bfd388 100644
--- a/dev/WindowsAppRuntime_DLL/WindowsAppRuntime.def
+++ b/dev/WindowsAppRuntime_DLL/WindowsAppRuntime.def
@@ -2,6 +2,7 @@
 ; Licensed under the MIT License. See LICENSE in the project root for license information.
 
 EXPORTS
+    DetourFinishHelperProcess                               @1 NONAME
     DllCanUnloadNow = WINRT_CanUnloadNow                    PRIVATE
     DllGetActivationFactory = WINRT_GetActivationFactory    PRIVATE
     DllGetClassObject                                       PRIVATE