diff --git a/dlls/wow64/syscall.c b/dlls/wow64/syscall.c
index 5c9bc8d4f27..6803efbd7e9 100644
--- a/dlls/wow64/syscall.c
+++ b/dlls/wow64/syscall.c
@@ -398,6 +398,15 @@ NTSTATUS WINAPI Wow64SystemServiceEx( UINT num, UINT *args )
 }
 
 
+/**********************************************************************
+ *           Wow64ApcRoutine  (NTDLL.@)
+ */
+void WINAPI Wow64ApcRoutine( ULONG_PTR arg1, ULONG_PTR arg2, ULONG_PTR arg3, CONTEXT *context )
+{
+    FIXME( "stub %lx %lx %lx\n", arg1, arg2, arg3 );
+}
+
+
 /**********************************************************************
  *           Wow64LdrpInitialize  (NTDLL.@)
  */
diff --git a/dlls/wow64/wow64.spec b/dlls/wow64/wow64.spec
index a477b6b628a..8f188043556 100644
--- a/dlls/wow64/wow64.spec
+++ b/dlls/wow64/wow64.spec
@@ -1,7 +1,7 @@
 @ stub Wow64AllocThreadHeap
 @ stub Wow64AllocateHeap
 @ stub Wow64AllocateTemp
-@ stub Wow64ApcRoutine
+@ stdcall Wow64ApcRoutine(long long long ptr)
 @ stub Wow64CheckIfNXEnabled
 @ stub Wow64EmulateAtlThunk
 @ stub Wow64FreeHeap
diff --git a/dlls/wow64/wow64_private.h b/dlls/wow64/wow64_private.h
index affd39df03b..5ec8ef9d847 100644
--- a/dlls/wow64/wow64_private.h
+++ b/dlls/wow64/wow64_private.h
@@ -28,6 +28,8 @@
 ALL_SYSCALLS
 #undef SYSCALL_ENTRY
 
+void WINAPI Wow64ApcRoutine( ULONG_PTR arg1, ULONG_PTR arg2, ULONG_PTR arg3, CONTEXT *context ) DECLSPEC_HIDDEN;
+
 extern USHORT native_machine DECLSPEC_HIDDEN;
 extern USHORT current_machine DECLSPEC_HIDDEN;