diff --git a/lib/debug/thread_client.rb b/lib/debug/thread_client.rb
index c106a58ec..b0e9d46f2 100644
--- a/lib/debug/thread_client.rb
+++ b/lib/debug/thread_client.rb
@@ -865,12 +865,13 @@ class SuspendReplay < Exception
       private def fiber_blocking
         ::Fiber.blocking{yield}
       end
-    else
+    elsif ::Fiber.method_defined?(:blocking?)
       private def fiber_blocking
-        yield
+        ::Fiber.new(blocking: true){yield}.resume
       end
+    else
+      yield
     end
-    
 
     def wait_next_action
       fiber_blocking{wait_next_action_}