diff --git a/lib/rbkb/extends/string.rb b/lib/rbkb/extends/string.rb
index 7c24e2f..b0a6e1e 100644
--- a/lib/rbkb/extends/string.rb
+++ b/lib/rbkb/extends/string.rb
@@ -241,7 +241,7 @@ def rotate_bytes(k=0)
 
       # String randomizer
       def randomize
-        self.split('').randomize.to_s
+        self.split('').randomize.join
       end