diff --git a/cloud/shepherd/manager/provider_test.go b/cloud/shepherd/manager/provider_test.go
index d1c6361..b08c8b7 100644
--- a/cloud/shepherd/manager/provider_test.go
+++ b/cloud/shepherd/manager/provider_test.go
@@ -21,6 +21,10 @@
 	agentStarted bool
 }
 
+func (dm *dummyMachine) Failed() bool {
+	return false
+}
+
 func (dm *dummyMachine) ID() shepherd.ProviderID {
 	return dm.id
 }