diff --git a/lib/_http_client.js b/lib/_http_client.js
index 9088239f52ea5a..22eadfb5584676 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -361,7 +361,7 @@ function socketOnData(d) {
 
   var ret = parser.execute(d);
   if (ret instanceof Error) {
-    debug('parse error');
+    debug('parse error', ret);
     freeParser(parser, req, socket);
     socket.destroy();
     req.emit('error', ret);
diff --git a/lib/_http_server.js b/lib/_http_server.js
index c9397a0bc2a4e7..63d3fb10cf870b 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -379,7 +379,7 @@ function connectionListener(socket) {
 
   function onParserExecuteCommon(ret, d) {
     if (ret instanceof Error) {
-      debug('parse error');
+      debug('parse error', ret);
       socketOnError.call(socket, ret);
     } else if (parser.incoming && parser.incoming.upgrade) {
       // Upgrade or CONNECT