diff --git a/heat_integrationtests/functional/test_software_config.py b/heat_integrationtests/functional/test_software_config.py
index 860d688266..815893f1bf 100644
--- a/heat_integrationtests/functional/test_software_config.py
+++ b/heat_integrationtests/functional/test_software_config.py
@@ -149,7 +149,7 @@ properties:
             iv = dict((i['name'], i['value']) for i in dep['inputs'])
             sigurl = iv.get('deploy_signal_id')
             requests.post(sigurl, data='{}',
-                          headers={'content-type': None},
+                          headers={'content-type': 'application/json'},
                           verify=self.verify_cert)