diff --git a/src/slic3r/GUI/Search.hpp b/src/slic3r/GUI/Search.hpp
index 30b969112..a9ced75dd 100644
--- a/src/slic3r/GUI/Search.hpp
+++ b/src/slic3r/GUI/Search.hpp
@@ -4,6 +4,8 @@
 #include <vector>
 #include <map>
 
+#include <boost/nowide/convert.hpp>
+
 #include <wx/panel.h>
 #include <wx/sizer.h>
 #include <wx/listctrl.h>