diff --git a/passerelle/apps/atos_genesys/utils.py b/passerelle/apps/atos_genesys/utils.py
index 3f5bb56d..c9acc184 100644
--- a/passerelle/apps/atos_genesys/utils.py
+++ b/passerelle/apps/atos_genesys/utils.py
@@ -66,7 +66,7 @@ class RowLockedCache(object):
                         cache.set(key, {'value': value, 'timestamp': now}, CACHE_DURATION)
                     except APIError as e:
                         if self.logger:
-                            self.logger.error('failure to update cache %s', e)
+                            self.logger.error('failure to update cache (%s)', e)
             return cacheline['value']
         else:
             value = self.function(*args, **kwargs)