diff --git a/openedx/core/djangoapps/catalog/management/commands/cache_programs.py b/openedx/core/djangoapps/catalog/management/commands/cache_programs.py
index fc8c86316d..ec4f521d40 100644
--- a/openedx/core/djangoapps/catalog/management/commands/cache_programs.py
+++ b/openedx/core/djangoapps/catalog/management/commands/cache_programs.py
@@ -41,7 +41,7 @@ class Command(BaseCommand):
                 user = User.objects.get(username=username)
             except User.DoesNotExist:
                 logger.error(
-                    'Failed to create API client. Service user {username} does not exist.'.format(username)
+                    'Failed to create API client. Service user {username} does not exist.'.format(username=username)
                 )
                 raise
 
@@ -85,7 +85,7 @@ class Command(BaseCommand):
                 client = create_catalog_api_client(user)
             except User.DoesNotExist:
                 logger.error(
-                    'Failed to create API client. Service user {username} does not exist.'.format(username)
+                    'Failed to create API client. Service user {username} does not exist.'.format(username=username)
                 )
                 raise