diff --git a/joeynmt_server/views/validate.py b/joeynmt_server/views/validate.py
index e0c3a8f79d8bef08f1ae7e8ec9551e32a2cb9ffd..dcc7740e4060d13738f293abc830c28b4b4a5163 100644
--- a/joeynmt_server/views/validate.py
+++ b/joeynmt_server/views/validate.py
@@ -35,7 +35,7 @@ def validate():
     return jsonify(response), status
 
 
-@current_app.route('/validations', methods='GET')
+@current_app.route('/validations', methods=['GET'])
 def validations():
     label = request.args.get('label')