diff --git a/lib/http_proxy.c b/lib/http_proxy.c
index d7ed11761..ba67b861b 100644
--- a/lib/http_proxy.c
+++ b/lib/http_proxy.c
@@ -632,6 +632,7 @@ static CURLcode CONNECT(struct connectdata *conn,
   conn->allocptr.proxyuserpwd = NULL;
 
   data->state.authproxy.done = TRUE;
+  data->state.authproxy.multipass = FALSE;
 
   infof(data, "Proxy replied %d to CONNECT request\n",
         data->info.httpproxycode);