diff --git a/src/middleware/request.js b/src/middleware/request.js
index 5583ae1..410546d 100644
--- a/src/middleware/request.js
+++ b/src/middleware/request.js
@@ -8,7 +8,7 @@ const _global = {
 }
 
 function handleResponse (span, status, err, msg) {
-  if (err || status >= 400) {
+  if (err instanceof Error || status >= 400) {
     // Error detected.  Mark error, status code, and log error event
     span.setTag('error', true)
     if (status) span.setTag('http.status_code', status)
diff --git a/test/request.spec.js b/test/request.spec.js
index 871475a..6fbf087 100644
--- a/test/request.spec.js
+++ b/test/request.spec.js
@@ -15,6 +15,9 @@ function createServer () {
     req.on('end', () => {
       let path = urlParse(req.url).pathname
       let status = Number(path.split('?')[0].split('/')[1])
+      if (req.headers && req.headers['content-type'] === 'application/json'){
+        b = JSON.parse(b)
+      }
       switch (status) {
         case 301:
           res.writeHead(301, { Location: '/200' })
@@ -146,6 +149,14 @@ describe('request', () => {
       })
   })
 
+  it('should not mark error on 200', () => {
+    return tr({ method: 'PUT', uri: `${s.url}/200`, json: true, body: {data: 'test data'} })
+      .then(() => {
+        let rec = JSON.parse(buf[0])
+        rec.tags.should.not.have.property('error')
+      })
+  })
+
   it('should mark http.status_code on 400', () => {
     return tr({ method: 'GET', uri: `${s.url}/400`, json: true })
       .catch(() => {