diff --git a/widget/src/windows/nsDataObj.h b/widget/src/windows/nsDataObj.h
index 3bb1f410a44..87d24399c45 100644
--- a/widget/src/windows/nsDataObj.h
+++ b/widget/src/windows/nsDataObj.h
@@ -44,6 +44,7 @@
 // The above are required for __MINGW32__
 #include <oleidl.h>
 #include <shldisp.h>
+#include <shlobj.h>
 
 //#include "Ddforw.h"
 #include "nsString.h"