diff --git a/activesupport/lib/active_support/buffered_logger.rb b/activesupport/lib/active_support/buffered_logger.rb
index 6553d72b4f..77e0b1d33f 100644
--- a/activesupport/lib/active_support/buffered_logger.rb
+++ b/activesupport/lib/active_support/buffered_logger.rb
@@ -116,7 +116,7 @@ module ActiveSupport
       end
 
       def clear_buffer
-        @buffer[Thread.current] = []
+        @buffer.delete(Thread.current)
       end
   end
 end