diff --git a/twitter/api.py b/twitter/api.py
index 94ec3545..6a44b9c8 100644
--- a/twitter/api.py
+++ b/twitter/api.py
@@ -4650,9 +4650,9 @@ def VerifyCredentials(self, include_entities=None, skip_status=None, include_ema
         """
         url = '%s/account/verify_credentials.json' % self.base_url
         data = {
-            'include_entities': enf_type('include_entities', bool, include_entities),
-            'skip_status': enf_type('skip_status', bool, skip_status),
-            'include_email': enf_type('include_email', bool, include_email)
+            'include_entities': 'true' if enf_type('include_entities', bool, include_entities) else 'false',
+            'skip_status': 'true' if enf_type('skip_status', bool, skip_status) else 'false',
+            'include_email': 'true' if enf_type('include_email', bool, include_email) else 'false'
         }
 
         resp = self._RequestUrl(url, 'GET', data)