diff --git a/src/frontends/qt4/Toolbars.h b/src/frontends/qt4/Toolbars.h
index 07e1e47ff8..99d12efc53 100644
--- a/src/frontends/qt4/Toolbars.h
+++ b/src/frontends/qt4/Toolbars.h
@@ -16,6 +16,7 @@
 #include "FuncRequest.h"
 
 #include <vector>
+#include <map>
 
 
 namespace lyx {