diff --git a/dlls/amstream/ddrawstream.c b/dlls/amstream/ddrawstream.c
index e2f24c3b4c8..c471a66200d 100644
--- a/dlls/amstream/ddrawstream.c
+++ b/dlls/amstream/ddrawstream.c
@@ -377,6 +377,9 @@ static HRESULT WINAPI ddraw_IDirectDrawMediaStream_GetDirectDraw(IDirectDrawMedi
 
     TRACE("(%p)->(%p)\n", iface, ddraw);
 
+    if (!ddraw)
+        return E_POINTER;
+
     *ddraw = NULL;
     if (!This->ddraw)
     {