diff --git a/src/udevil.c b/src/udevil.c
index 0dc1190..ee83be0 100644
--- a/src/udevil.c
+++ b/src/udevil.c
@@ -14,6 +14,9 @@
 #endif
 #include <time.h>
 
+// locale
+#include <locale.h>
+
 // glib
 #include <glib.h>
 #include <glib/gstdio.h>