diff --git a/cinderclient/openstack/common/apiclient/exceptions.py b/cinderclient/openstack/common/apiclient/exceptions.py
index 4776d5872..565c47e8a 100644
--- a/cinderclient/openstack/common/apiclient/exceptions.py
+++ b/cinderclient/openstack/common/apiclient/exceptions.py
@@ -426,7 +426,7 @@ def from_response(response, method, url):
             pass
         else:
             if hasattr(body, "keys"):
-                error = body[body.keys()[0]]
+                error = body[list(body.keys())[0]]
                 kwargs["message"] = error.get("message", None)
                 kwargs["details"] = error.get("details", None)
     elif content_type.startswith("text/"):