diff --git a/check_http_json.py b/check_http_json.py
index 08df991..6eb9977 100755
--- a/check_http_json.py
+++ b/check_http_json.py
@@ -406,6 +406,7 @@ if __name__ == "__main__":
 	# Attempt to reach the endpoint
 	try:
 		req = urllib2.Request(url)
+		req.add_header('Content-Type', 'application/json')
 		if args.auth:
 			base64str = base64.encodestring(args.auth).replace('\n', '')
 			req.add_header('Authorization', 'Basic %s' % base64str)