diff --git a/lib/pp.rb b/lib/pp.rb
index 8176e2d6ac..3647297cfb 100644
--- a/lib/pp.rb
+++ b/lib/pp.rb
@@ -193,7 +193,7 @@ class PP < PrettyPrint
     end
 
     def object_address_group(obj, &block)
-      group(1, sprintf('#<%s:0x%.x', obj.class.to_s, obj.__id__ * 2), '>', &block)
+      group(1, "\#<#{obj.class}:#{("0x%x" % (obj.__id__ * 2)).sub(/\.\.f/, '')}", '>', &block)
     end
 
     def comma_breakable