diff --git a/activesupport/lib/active_support/subscriber.rb b/activesupport/lib/active_support/subscriber.rb
index 54c770ac356068bbcffdde7d5c1e09bac3c11cee..5a4c3d74afc090c325f2f545c7aa8e5fd57c4bd5 100644
--- a/activesupport/lib/active_support/subscriber.rb
+++ b/activesupport/lib/active_support/subscriber.rb
@@ -88,7 +88,7 @@ def start(name, id, payload)
     end
 
     def finish(name, id, payload)
-      event     = event_stack.pop
+      event = event_stack.pop
       event.finish!
       event.payload.merge!(payload)