diff --git a/environment.rb b/environment.rb
index f1185d8e..e29acd95 100644
--- a/environment.rb
+++ b/environment.rb
@@ -199,4 +199,6 @@ Airbrake.add_filter do |notice|
     # Filter out password.
     notice[:params][:password] = '[Filtered]'
   end
-end
\ No newline at end of file
+
+  notice.ignore! if notice.stash[:exception].is_a?(Sinatra::NotFound)
+end