diff --git a/os/strcasestr.c b/os/strcasestr.c
index 1ca2ad6bb..3189cf21e 100644
--- a/os/strcasestr.c
+++ b/os/strcasestr.c
@@ -36,7 +36,6 @@
 
 #include <ctype.h>
 #include <string.h>
-#include "dix.h"
 
 /*
  * Find the first occurrence of find in s, ignore case.