diff --git a/nova/scheduler/rpcapi.py b/nova/scheduler/rpcapi.py
index 11f8984c03f6..28ba4001a33d 100644
--- a/nova/scheduler/rpcapi.py
+++ b/nova/scheduler/rpcapi.py
@@ -70,7 +70,7 @@ class SchedulerAPI(nova.openstack.common.rpc.proxy.RpcProxy):
 2.7 - Add select_destinations()
 2.8 - Deprecate prep_resize() -- JUST KIDDING. It is still used
 by the compute manager for retries.
- 2.9 - Added the leagacy_bdm_in_spec parameter to run_instances
+ 2.9 - Added the leagacy_bdm_in_spec parameter to run_instance()
 2.10 - Deprecated live_migration() call, moved to conductor
 '''
 
@@ -103,13 +103,18 @@ class SchedulerAPI(nova.openstack.common.rpc.proxy.RpcProxy):
 def run_instance(self, ctxt, request_spec, admin_password,
 injected_files, requested_networks, is_first_time,
 filter_properties, legacy_bdm_in_spec=True):
- return self.cast(ctxt, self.make_msg('run_instance',
- request_spec=request_spec, admin_password=admin_password,
- injected_files=injected_files,
- requested_networks=requested_networks,
- is_first_time=is_first_time,
- filter_properties=filter_properties,
- legacy_bdm_in_spec=legacy_bdm_in_spec), version='2.9')
+ version = '2.0'
+ msg_kwargs = {'request_spec': request_spec,
+ 'admin_password': admin_password,
+ 'injected_files': injected_files,
+ 'requested_networks': requested_networks,
+ 'is_first_time': is_first_time,
+ 'filter_properties': filter_properties}
+ if self.can_send_version('2.9'):
+ version = '2.9'
+ msg_kwargs['legacy_bdm_in_spec'] = legacy_bdm_in_spec
+ return self.cast(ctxt, self.make_msg('run_instance', **msg_kwargs),
+ version=version)
 
 def prep_resize(self, ctxt, instance, instance_type, image,
 request_spec, filter_properties, reservations):
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