diff --git a/libutil/util_opt.c b/libutil/util_opt.c
index 2e59687e..48c25140 100644
--- a/libutil/util_opt.c
+++ b/libutil/util_opt.c
@@ -9,7 +9,6 @@
  * it under the terms of the MIT license. See LICENSE for details.
  */
 
-#include <argz.h>
 #include <libgen.h>
 #include <stdbool.h>
 #include <stdio.h>