diff --git a/zabbix/zabbix_api.py b/zabbix/zabbix_api.py
index 5f13e6c..e177ddb 100644
--- a/zabbix/zabbix_api.py
+++ b/zabbix/zabbix_api.py
@@ -256,7 +256,7 @@ def test_login(self):
             return False
 
     def do_request(self, json_obj):
-        headers = {'Content-Type': 'application/json-rpc',
+        headers = {'Content-Type': 'application/json',
                    'User-Agent': 'python/zabbix_api'}
 
         if self.httpuser: