diff --git a/indra/viewer_components/login/lllogin.cpp b/indra/viewer_components/login/lllogin.cpp
index 9193d32b498ff0494e430097ee121f0bac653a7c..1a064593182baa0ad2b59c19411f9e2ccc4de038 100644
--- a/indra/viewer_components/login/lllogin.cpp
+++ b/indra/viewer_components/login/lllogin.cpp
@@ -23,6 +23,7 @@
  * $/LicenseInfo$
  */
 
+#include "llwin32headers.h"
 #include "linden_common.h"
 #include "llsd.h"
 #include "llsdutil.h"