diff --git a/src/sp-application.c b/src/sp-application.c
index a2892391..280960c9 100644
--- a/src/sp-application.c
+++ b/src/sp-application.c
@@ -19,6 +19,7 @@
 #include "config.h"
 
 #include <glib/gi18n.h>
+#include <locale.h>
 
 #include "sp-application.h"
 #include "sp-credits.h"