diff --git a/contrib/command-not-found/pk-command-not-found.c b/contrib/command-not-found/pk-command-not-found.c
index e88da7e23..23bbdb098 100644
--- a/contrib/command-not-found/pk-command-not-found.c
+++ b/contrib/command-not-found/pk-command-not-found.c
@@ -22,6 +22,7 @@
 #include "config.h"
 
 #include <string.h>
+#include <locale.h>
 #include <glib/gi18n.h>
 #include <dbus/dbus-glib.h>
 #include <packagekit-glib/packagekit.h>