diff --git a/src/event/ngx_event_connect.c b/src/event/ngx_event_connect.c
index c5bb806..e7f28c9 100644
--- a/src/event/ngx_event_connect.c
+++ b/src/event/ngx_event_connect.c
@@ -388,7 +388,16 @@
             return NGX_ERROR;
         }
 
+#else
+
+        ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
+                      "could not enable transparent proxying for IPv6 "
+                      "on this platform");
+
+        return NGX_ERROR;
+
 #endif
+
         break;
 
 #endif /* NGX_HAVE_INET6 */