diff --git a/reactos/dll/win32/user32/misc/stubs.c b/reactos/dll/win32/user32/misc/stubs.c
index 01cf77bafe0..f6ee6bd2e42 100644
--- a/reactos/dll/win32/user32/misc/stubs.c
+++ b/reactos/dll/win32/user32/misc/stubs.c
@@ -15,20 +15,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(user32);
 
-/*
- * @unimplemented
- */
-BOOL
-STDCALL
-AttachThreadInput(
-  DWORD idAttach,
-  DWORD idAttachTo,
-  BOOL fAttach)
-{
-  return NtUserAttachThreadInput(idAttach, idAttachTo, fAttach);
-}
-
-
 /*
  * @unimplemented
  */
diff --git a/reactos/dll/win32/user32/user32.def b/reactos/dll/win32/user32/user32.def
index 342cbffdfcd..fb31dbff918 100644
--- a/reactos/dll/win32/user32/user32.def
+++ b/reactos/dll/win32/user32/user32.def
@@ -12,7 +12,7 @@ AnyPopup@0
 AppendMenuA@16
 AppendMenuW@16
 ArrangeIconicWindows@4
-AttachThreadInput@12
+AttachThreadInput@12=NtUserAttachThreadInput@12
 BeginDeferWindowPos@4
 BeginPaint@8
 BlockInput@4