diff --git a/lib/ws.c b/lib/ws.c
index 304805d166..1f354b370e 100644
--- a/lib/ws.c
+++ b/lib/ws.c
@@ -25,6 +25,7 @@
 
 #ifdef USE_WEBSOCKETS
 
+#include <curl/curl.h>
 #include "urldata.h"
 #include "dynbuf.h"
 #include "rand.h"