diff --git a/lib/select.c b/lib/select.c
index bb9b8b0db..1c6481cb7 100644
--- a/lib/select.c
+++ b/lib/select.c
@@ -39,6 +39,10 @@
 #include <dos.h>  /* delay() */
 #endif
 
+#ifdef __VXWORKS__
+#include <strings.h>  /* bzero() in FD_SET */
+#endif
+
 #include <curl/curl.h>
 
 #include "urldata.h"