diff --git a/command/build/command.go b/command/build/command.go
index 45d32773e..35bb6331d 100644
--- a/command/build/command.go
+++ b/command/build/command.go
@@ -5,6 +5,7 @@ import "github.com/mitchellh/packer/packer"
 type Command byte
 
 func (Command) Run(env packer.Environment, arg []string) int {
+	env.Ui().Say("YO!")
 	return 0
 }
 
diff --git a/packer.go b/packer.go
index afd6873de..630b5cf75 100644
--- a/packer.go
+++ b/packer.go
@@ -11,6 +11,8 @@ import (
 )
 
 func main() {
+	defer plugin.CleanupClients()
+
 	commands := map[string]string {
 		"build": "packer-build",
 	}