diff --git a/app.py b/app.py
index f70ee5e..8d39a78 100644
--- a/app.py
+++ b/app.py
@@ -162,6 +162,7 @@ def define():
         return send_file("html/dictionary.html")
     with open(dictionary_json, 'r') as data:
         dictionary = json.load(data)
+    ref = ref.lower()
     if not ref in dictionary.keys():
         return "{} not found".format(ref)