diff --git a/builder/docker/driver_mock.go b/builder/docker/driver_mock.go
index 4cca3325b..4ffc69299 100644
--- a/builder/docker/driver_mock.go
+++ b/builder/docker/driver_mock.go
@@ -28,6 +28,10 @@ type MockDriver struct {
 	IPAddressResult string
 	IPAddressErr    error
 
+	KillCalled bool
+	KillID     string
+	KillError  error
+
 	LoginCalled   bool
 	LoginUsername string
 	LoginPassword string
@@ -160,6 +164,12 @@ func (d *MockDriver) StartContainer(config *ContainerConfig) (string, error) {
 	return d.StartID, d.StartError
 }
 
+func (d *MockDriver) KillContainer(id string) error {
+	d.KillCalled = true
+	d.KillID = id
+	return d.KillError
+}
+
 func (d *MockDriver) StopContainer(id string) error {
 	d.StopCalled = true
 	d.StopID = id