diff --git a/designateclient/v2/client.py b/designateclient/v2/client.py
index baa5721..7ef6f20 100644
--- a/designateclient/v2/client.py
+++ b/designateclient/v2/client.py
@@ -64,7 +64,7 @@ class DesignateAdapter(adapter.LegacyJsonAdapter):
         if self.edit_managed:
             kwargs['headers'].setdefault(
                 'X-Designate-Edit-Managed-Records',
-                self.edit_managed
+                str(self.edit_managed)
             )
 
         if self.sudo_project_id is not None: