diff --git a/ennstatus/api/views.py b/ennstatus/api/views.py
--- a/ennstatus/api/views.py
+++ b/ennstatus/api/views.py
@@ -101,9 +101,14 @@ def update():
         return str(e), 500, {'Content-Type': 'text/plain'}
 
     current_app.logger.info('Return result')
-    return (server.json(), 201,
-            {'Location': '/api/export/json/single?server_name=%s'
-             % server.name})
+    return (
+        server.json(), 201,
+        {
+            'Location': '/api/export/json/single?server_name={}'.format(
+                server.name
+            )
+        }
+    )
 
 
 @api_page.route('/export', defaults={'server_type': 'all',
@@ -146,7 +151,7 @@ def export(export_format, server_type):
             current_app.logger.info('Getting all servers!')
             servers = [server.json() for server in all_servers()]
         else:
-            current_app.logger.info('Getting all %s!' % server_type)
+            current_app.logger.info('Getting all {}!'.format(server_type))
             servers = list(all_servers_by_type(server_type.lower()))
 
         if export_format == 'json':