diff --git a/src/osgPlugins/gecko/UBrowser.h b/src/osgPlugins/gecko/UBrowser.h
index 0662a23c1..d74d00b67 100644
--- a/src/osgPlugins/gecko/UBrowser.h
+++ b/src/osgPlugins/gecko/UBrowser.h
@@ -19,6 +19,7 @@
 #include <osg/OperationThread>
 
 #include <list>
+#include <algorithm>
 
 #include <nsGUIEvent.h>
 #include "llmozlib2.h"