diff --git a/src/flow/lib/models/service_pool.rb b/src/flow/lib/models/service_pool.rb
index 34ada0c02f..e0e4734c15 100644
--- a/src/flow/lib/models/service_pool.rb
+++ b/src/flow/lib/models/service_pool.rb
@@ -67,9 +67,11 @@ module OpenNebula
                     return rc
                 end
 
-                block.call(service)
+                rc = block.call(service)
 
                 service.unlock()
+
+                return rc
             else
                 rc = service.info