diff --git a/aleksis/apps/chronos/frontend/messages/en.json b/aleksis/apps/chronos/frontend/messages/en.json
index ee23c28f02b5b872222461653ea1e624eff54c5b..859b8bb8fe95a5fabd0cc5a747d14098ac302725 100644
--- a/aleksis/apps/chronos/frontend/messages/en.json
+++ b/aleksis/apps/chronos/frontend/messages/en.json
@@ -35,7 +35,7 @@
       "amend": {
         "edit_button": "Change",
         "delete_button": "Reset",
-        "delete_dialog": " Are you sure you want to delete this substitution?",
+        "delete_dialog": "Are you sure you want to delete this substitution?",
         "delete_success": "The substitution was deleted successfully.",
         "title": "Change lesson",
         "subject": "Subject",