diff --git a/lib/concurrent/promise.rb b/lib/concurrent/promise.rb
index f23700e90..5846c6f08 100644
--- a/lib/concurrent/promise.rb
+++ b/lib/concurrent/promise.rb
@@ -479,6 +479,7 @@ def self.aggregate(method, *promises)
         unless completed.empty? || completed.send(method){|promise| promise.fulfilled? }
           raise PromiseExecutionError
         end
+        completed
       end
       composite
     end