diff --git a/lib/mrsk/commands/app.rb b/lib/mrsk/commands/app.rb
index 5b7c0f36..18b93ee8 100644
--- a/lib/mrsk/commands/app.rb
+++ b/lib/mrsk/commands/app.rb
@@ -20,7 +20,7 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
   end
 
   def current_container_id
-    docker :ps, "-q", service_filter
+    docker :ps, "-q", *service_filter
   end
 
   def stop