diff --git a/rfb_win32/FolderManager.h b/rfb_win32/FolderManager.h
index 1baff92..ad23c3d 100644
--- a/rfb_win32/FolderManager.h
+++ b/rfb_win32/FolderManager.h
@@ -24,6 +24,8 @@
 #ifndef __RFB_WIN32_FOLDERMANAGER_H__
 #define __RFB_WIN32_FOLDERMANAGER_H__
 
+#include <windows.h>
+
 #include <rfb/FileInfo.h>
 #include <rfb/DirManager.h>