diff --git a/lib/hypervisor/hv_fake.py b/lib/hypervisor/hv_fake.py
index 214ade44448ba7423d95ecd18dd1f0ab4945bd8a..fdfbdef21ccc4939c7ea428bab21f0047e354464 100644
--- a/lib/hypervisor/hv_fake.py
+++ b/lib/hypervisor/hv_fake.py
@@ -107,7 +107,7 @@ class FakeHypervisor(hv_base.BaseHypervisor):
         raise errors.HypervisorError("Failed to list instances: %s" % err)
     return data
 
-  def StartInstance(self, instance, force, extra_args):
+  def StartInstance(self, instance, block_devices, extra_args):
     """Start an instance.
 
     For the fake hypervisor, it just creates a file in the base dir,