diff --git a/lib/_http_client.js b/lib/_http_client.js
index 7707fa74cf784a..3c6950794ac9e8 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -451,7 +451,7 @@ 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 7b3f004f9aff03..7431d093a4022f 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -453,7 +453,7 @@ function socketOnError(e) {
 
 function onParserExecuteCommon(server, socket, parser, state, 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