diff --git a/History.txt b/History.txt
index 738512a..2ec755b 100644
--- a/History.txt
+++ b/History.txt
@@ -1,3 +1,8 @@
+Version 2.0.10
+=====
+
+* #7 fix FrozenError in Resque::Plugins::MultiStepTask
+
 Version 2.0.0
 =====
 
diff --git a/lib/resque/plugins/multi_step_task.rb b/lib/resque/plugins/multi_step_task.rb
index c229330..e3c2689 100644
--- a/lib/resque/plugins/multi_step_task.rb
+++ b/lib/resque/plugins/multi_step_task.rb
@@ -59,8 +59,8 @@ def create(slug=nil)
                     else
                       slug.to_s
                     end
-          task_id << "~" << nonce
-          
+          task_id = "#{task_id}~#{nonce}"
+
           mst = new(task_id)
           mst.nuke
           redis.sadd("active-tasks", task_id)