1 files changed, 4 insertions, 2 deletions
diff --git a/lib/http_negotiate.c b/lib/http_negotiate.c
index 9e1a83ccc..92113eb07 100644
--- a/lib/http_negotiate.c
+++ b/lib/http_negotiate.c
@@ -53,14 +53,16 @@ CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
   if(proxy) {
     userp = conn->proxyuser;
     passwdp = conn->proxypasswd;
-    service = data->set.str[STRING_PROXY_SERVICE_NAME];
+    service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
+              data->set.str[STRING_PROXY_SERVICE_NAME] : "HTTP";
     host = conn->proxy.name;
     neg_ctx = &data->state.proxyneg;
   }
   else {
     userp = conn->user;
     passwdp = conn->passwd;
-    service = data->set.str[STRING_SERVICE_NAME];
+    service = data->set.str[STRING_SERVICE_NAME] ?
+              data->set.str[STRING_SERVICE_NAME] : "HTTP";
     host = conn->host.name;
     neg_ctx = &data->state.negotiate;
   }