diff --git a/activesupport/lib/active_support/tagged_logging.rb b/activesupport/lib/active_support/tagged_logging.rb
index 0aaf36501f..c510515f99 100644
--- a/activesupport/lib/active_support/tagged_logging.rb
+++ b/activesupport/lib/active_support/tagged_logging.rb
@@ -33,7 +33,12 @@ def call(severity, timestamp, progname, msg)
       end
 
       def tagged(*tags)
-        new_tags = push_tags(*tags)
+        new_tags = if tags.length == 1
+          current_tags << tags[0] unless tags[0].blank?
+          tags
+        else
+          push_tags(*tags)
+        end
         yield self
       ensure
         pop_tags(new_tags.size)