diff --git a/app/models/application.rb b/app/models/application.rb
index c7b3853..a13ecc5 100644
--- a/app/models/application.rb
+++ b/app/models/application.rb
@@ -43,6 +43,10 @@ class Application < ApplicationRecord
     normalized = pattern&.strip&.downcase
     normalized.blank? ? nil : normalized
   }
+  normalizes :backchannel_logout_uri, with: ->(uri) {
+    normalized = uri&.strip
+    normalized.blank? ? nil : normalized
+  }
 
   before_validation :generate_client_credentials, on: :create, if: :oidc?