diff --git a/src/frontends/controllers/Dialog.h b/src/frontends/controllers/Dialog.h
index e2ce1d4d04..d88be2da3f 100644
--- a/src/frontends/controllers/Dialog.h
+++ b/src/frontends/controllers/Dialog.h
@@ -16,6 +16,7 @@
 #include "lfuns.h"
 
 #include "support/docstring.h"
+#include <boost/scoped_ptr.hpp>
 
 namespace lyx {
 namespace frontend {