diff --git a/mistralclient/api/httpclient.py b/mistralclient/api/httpclient.py
index aeb2de8a..f355cca6 100644
--- a/mistralclient/api/httpclient.py
+++ b/mistralclient/api/httpclient.py
@@ -50,8 +50,8 @@ LOG = logging.getLogger(__name__)
 def log_request(func):
     def decorator(self, *args, **kwargs):
         resp = func(self, *args, **kwargs)
-        LOG.debug("HTTP %s %s %d" % (resp.request.method, resp.url,
-                  resp.status_code))
+        LOG.debug("HTTP %s %s %d", resp.request.method, resp.url,
+                  resp.status_code)
         return resp
     return decorator
 
diff --git a/mistralclient/auth/keycloak.py b/mistralclient/auth/keycloak.py
index b502efa5..2f5bc7df 100644
--- a/mistralclient/auth/keycloak.py
+++ b/mistralclient/auth/keycloak.py
@@ -145,10 +145,8 @@ class KeycloakAuthHandler(auth.AuthHandler):
         except Exception as e:
             raise Exception("Failed to get access token:\n %s" % str(e))
 
-        LOG.debug(
-            "HTTP response from OIDC provider: %s" %
-            pprint.pformat(resp.json())
-        )
+        LOG.debug("HTTP response from OIDC provider: %s",
+                  pprint.pformat(resp.json()))
 
         return resp.json()['access_token']