diff --git a/dlls/dwmapi/dwmapi.spec b/dlls/dwmapi/dwmapi.spec
index 27e07045e91..7c613d0ad46 100644
--- a/dlls/dwmapi/dwmapi.spec
+++ b/dlls/dwmapi/dwmapi.spec
@@ -30,7 +30,7 @@
 @ stdcall DwmGetColorizationColor(ptr long)
 @ stub DwmGetCompositionTimingInfo
 @ stdcall DwmGetGraphicsStreamClient(long ptr)
-@ stub DwmGetGraphicsStreamTransformHint
+@ stdcall DwmGetGraphicsStreamTransformHint(long ptr)
 @ stdcall DwmGetTransportAttributes(ptr ptr ptr)
 @ stub DwmGetWindowAttribute
 @ stdcall DwmIsCompositionEnabled(ptr)
diff --git a/dlls/dwmapi/dwmapi_main.c b/dlls/dwmapi/dwmapi_main.c
index 40ecec7bf00..60420282966 100644
--- a/dlls/dwmapi/dwmapi_main.c
+++ b/dlls/dwmapi/dwmapi_main.c
@@ -149,3 +149,13 @@ HRESULT WINAPI DwmEnableMMCSS(BOOL enableMMCSS)
 
     return S_OK;
 }
+
+/**********************************************************************
+ *           DwmGetGraphicsStreamTransformHint         (DWMAPI.@)
+ */
+HRESULT WINAPI DwmGetGraphicsStreamTransformHint(UINT uIndex, MilMatrix3x2D *pTransform)
+{
+    FIXME("(%d, %p) stub\n", uIndex, pTransform);
+
+    return E_NOTIMPL;
+}