diff --git a/src/http-proxy-middleware.ts b/src/http-proxy-middleware.ts
index e3012ec5..66fbf297 100644
--- a/src/http-proxy-middleware.ts
+++ b/src/http-proxy-middleware.ts
@@ -1,4 +1,5 @@
 import * as express from 'express';
+import { ClientRequest } from 'http';
 import * as httpProxy from 'http-proxy';
 import * as _ from 'lodash';
 import { createConfig } from './config-factory';
@@ -33,6 +34,9 @@ export class HttpProxyMiddleware {
     // log errors for debug purpose
     this.proxy.on('error', this.logError);
 
+    // fix proxied body if bodyParser is involved
+    this.proxy.on('proxyReq', this.fixBody);
+
     // https://github.com/chimurai/http-proxy-middleware/issues/19
     // expose function to upgrade externally
     (this.middleware as any).upgrade = (req, socket, head) => {
@@ -174,4 +178,12 @@ export class HttpProxyMiddleware {
 
     this.logger.error(errorMessage, req.url, hostname, target, err.code || err, errReference);
   };
+
+  private fixBody = (proxyReq: ClientRequest, req: Request) => {
+    if (req.is('application/json')) {
+      const bodyData = JSON.stringify(req.body);
+      proxyReq.setHeader('Content-Length', Buffer.byteLength(bodyData));
+      proxyReq.write(bodyData);
+    }
+  };
 }