diff --git a/lib/em-synchrony/amqp.rb b/lib/em-synchrony/amqp.rb
index c58d1b6..b701b95 100644
--- a/lib/em-synchrony/amqp.rb
+++ b/lib/em-synchrony/amqp.rb
@@ -22,7 +22,7 @@ def sync_cb fiber
             if fiber == Fiber.current
               return *args
             else
-              fiber.resume *args
+              fiber.resume(*args)
             end
           end
         end