diff --git a/lib/middleware/proxy.js b/lib/middleware/proxy.js
index 7c9a43214..2ce59124d 100644
--- a/lib/middleware/proxy.js
+++ b/lib/middleware/proxy.js
@@ -34,7 +34,7 @@ function parseProxyConfig (proxies, config) {
 
     const hostname = proxyDetails.hostname || config.hostname
     const protocol = proxyDetails.protocol || config.protocol
-    const https = proxyDetails.protocol === 'https:'
+    const https = protocol === 'https:'
     let port
     if (proxyDetails.port) {
       port = proxyDetails.port