diff --git a/include/locale.h b/include/locale.h
index e48add267..ed1d042bd 100644
--- a/include/locale.h
+++ b/include/locale.h
@@ -39,6 +39,7 @@ struct lconv {
 #define LC_MONETARY        4
 #define LC_NUMERIC         5
 #define LC_TIME            6
+#define LC_MESSAGES        7
 
 /* Function Prototypes. */
 _PROTOTYPE( char *setlocale, (int _category, const char *_locale)	);
diff --git a/lib/libc/ansi/setlocale.c b/lib/libc/ansi/setlocale.c
index 87bb74a55..8d098f21f 100644
--- a/lib/libc/ansi/setlocale.c
+++ b/lib/libc/ansi/setlocale.c
@@ -21,6 +21,7 @@ setlocale(int category, const char *locale)
 	case LC_TIME:
 	case LC_NUMERIC:
 	case LC_MONETARY:
+	case LC_MESSAGES:
 		return *locale ? (char *)locale : "C";
 	default:
 		return (char *)NULL;