diff --git a/lib/hostares.c b/lib/hostares.c
index 0f438477ccc0c281b2c516eada5f82b619f6f648..9d8ad1ba81ca6cb7887307b6b7072486a6bc2a72 100644
--- a/lib/hostares.c
+++ b/lib/hostares.c
@@ -75,6 +75,7 @@
 #include "share.h"
 #include "strerror.h"
 #include "url.h"
+#include "connect.h" /* for the Curl_sockerrno() proto */
 
 #define _MPRINTF_REPLACE /* use our functions only */
 #include <curl/mprintf.h>