1 files changed, 4 insertions, 4 deletions
diff --git a/spec/ruby/core/thread/element_set_spec.rb b/spec/ruby/core/thread/element_set_spec.rb
index 47b4d06328..b76078f685 100644
--- a/spec/ruby/core/thread/element_set_spec.rb
+++ b/spec/ruby/core/thread/element_set_spec.rb
@@ -9,12 +9,12 @@ describe "Thread#[]=" do
   it "raises a RuntimeError if the thread is frozen" do
     running = false
     t = Thread.new do
-      Thread.pass until running
       t.freeze
-      t[:foo] = "bar"
+      -> {
+        t[:foo] = "bar"
+      }.should raise_error(RuntimeError, /frozen/)
     end
-    running = true
-    lambda { t.join }.should raise_error(RuntimeError)
+    t.join
   end
 
   it "raises exceptions on the wrong type of keys" do