diff --git a/http.c b/http.c
index 7215f4976b..85399bf78e 100644
--- a/http.c
+++ b/http.c
@@ -842,6 +842,15 @@ static int http_request(const char *url, void *result, int target, int options)
 				init_curl_http_auth(slot->curl);
 				ret = HTTP_REAUTH;
 			}
+		} else if (results.http_code == 407) { /* Proxy authentication failure */
+			if (proxy_auth.username && proxy_auth.password) {
+				credential_reject(&proxy_auth);
+				ret = HTTP_NOAUTH;
+			} else {
+				credential_fill(&proxy_auth);
+				set_proxy_auth(slot->curl);
+				ret = HTTP_REAUTH;
+			}
 		} else {
 			if (!curl_errorstr[0])
 				strlcpy(curl_errorstr,