diff --git a/app/models/miq_worker/runner.rb b/app/models/miq_worker/runner.rb
index 776f086089c..5f94937f724 100644
--- a/app/models/miq_worker/runner.rb
+++ b/app/models/miq_worker/runner.rb
@@ -436,7 +436,7 @@ def self.ruby_object_usage
     ObjectSpace.each_object(Object) do |obj|
       next unless defined?(obj.class)
 
-      types[obj.class.name] += 1
+      types[obj.class.to_s] += 1
     end
     types
   end