diff --git a/win/rfb_win32/Security.cxx b/win/rfb_win32/Security.cxx
index 985f00c..b8887a9 100644
--- a/win/rfb_win32/Security.cxx
+++ b/win/rfb_win32/Security.cxx
@@ -23,7 +23,7 @@
 #include <rfb/LogWriter.h>
 
 #include <lmcons.h>
-#include <Accctrl.h>
+#include <accctrl.h>
 #include <list>
 
 using namespace rfb;