diff --git a/libc/include/limits.h b/libc/include/limits.h
index 5edf26ed..872d27a3 100644
--- a/libc/include/limits.h
+++ b/libc/include/limits.h
@@ -61,6 +61,7 @@ __BEGIN_DECLS
 #define NAME_MAX 255
 #define PATH_MAX 256
 #define LOGIN_NAME_MAX 256
+#define HOST_NAME_MAX 255
 
 __END_DECLS