diff --git a/projects/OS400/os400sys.c b/projects/OS400/os400sys.c
index 41f0f670e7..bea8450062 100644
--- a/projects/OS400/os400sys.c
+++ b/projects/OS400/os400sys.c
@@ -28,8 +28,6 @@
 #include <curl/curl.h>
 #include "config-os400.h"  /* Not curl_setup.h: we only need some defines. */
 
-#include <sys/types.h>
-#include <sys/socket.h>
 #include <sys/un.h>
 
 #include <stdlib.h>