diff --git a/Utilities/cmlibarchive/libarchive/archive_write_disk_set_standard_lookup.c b/Utilities/cmlibarchive/libarchive/archive_write_disk_set_standard_lookup.c
index 2869fb202..97828f68b 100644
--- a/Utilities/cmlibarchive/libarchive/archive_write_disk_set_standard_lookup.c
+++ b/Utilities/cmlibarchive/libarchive/archive_write_disk_set_standard_lookup.c
@@ -24,7 +24,7 @@
  */
 
 #ifndef _XOPEN_SOURCE
-# define _XOPEN_SOURCE 500 /* getpwuid_r and getgrgid_r signatures */
+# define _XOPEN_SOURCE 500 /* getpwnam_r and getgrnam_r signatures */
 #endif
 
 #include "archive_platform.h"