diff --git a/src/common/appbase.cpp b/src/common/appbase.cpp
index 296d1cc6c8..32db9d127e 100644
--- a/src/common/appbase.cpp
+++ b/src/common/appbase.cpp
@@ -46,6 +46,8 @@
   #include  <signal.h>      // for SIGTRAP used by wxTrap()
 #endif  //Win/Unix
 
+#include <locale.h>
+
 #if wxUSE_FONTMAP
     #include "wx/fontmap.h"
 #endif // wxUSE_FONTMAP