diff --git a/src/mem/ruby/config/cfg.rb b/src/mem/ruby/config/cfg.rb
index 8ed7de474..445bb4885 100644
--- a/src/mem/ruby/config/cfg.rb
+++ b/src/mem/ruby/config/cfg.rb
@@ -309,7 +309,7 @@ class CacheController < NetPort
       cache.controller = self
     }
 
-    if !@@total_cache_controllers.has_key?(mach_type)
+    if !@@total_cache_controllers.key?(mach_type)
       @@total_cache_controllers[mach_type] = 0
     end
     @version = @@total_cache_controllers[mach_type]