diff --git a/lib/http-proxy/common.js b/lib/http-proxy/common.js
index 2602305d7..bf467a2cd 100644
--- a/lib/http-proxy/common.js
+++ b/lib/http-proxy/common.js
@@ -49,6 +49,10 @@ common.setupOutgoing = function(outgoing, options, req, forward) {
   if (options.auth) {
     outgoing.auth = options.auth;
   }
+  
+  if (options.ca) {
+      outgoing.ca = options.ca;
+  }
 
   if (isSSL.test(options[forward || 'target'].protocol)) {
     outgoing.rejectUnauthorized = (typeof options.secure === "undefined") ? true : options.secure;