diff --git a/functional/test_cancel_update.py b/functional/test_cancel_update.py
index f6ddc07..bfeeda6 100644
--- a/functional/test_cancel_update.py
+++ b/functional/test_cancel_update.py
@@ -53,7 +53,7 @@
 
         stack_identifier = self.stack_create(template=self.template,
                                              parameters=parameters)
-        parameters['InstanceType'] = 'm1.large'
+        parameters['InstanceType'] = self.conf.instance_type
         self.update_stack(stack_identifier, self.template,
                           parameters=parameters,
                           expected_status='UPDATE_IN_PROGRESS')
diff --git a/functional/test_conditional_exposure.py b/functional/test_conditional_exposure.py
index bf6cc47..69cff79 100644
--- a/functional/test_conditional_exposure.py
+++ b/functional/test_conditional_exposure.py
@@ -23,13 +23,16 @@
     unavailable_service = 'Sahara'
     unavailable_template = """
 heat_template_version: 2015-10-15
+parameters:
+  instance_type:
+    type: string
 resources:
   not_available:
     type: OS::Sahara::NodeGroupTemplate
     properties:
       plugin_name: fake
       hadoop_version: 0.1
-      flavor: m1.large
+      flavor: {get_param: instance_type}
       node_processes: []
 """
 
@@ -56,9 +59,11 @@
 
     def test_unavailable_resources_not_created(self):
         stack_name = self._stack_rand_name()
+        parameters = {'instance_type': self.conf.minimal_instance_type}
         ex = self.assertRaises(exc.HTTPBadRequest,
                                self.client.stacks.create,
                                stack_name=stack_name,
+                               parameters=parameters,
                                template=self.unavailable_template)
         self.assertIn('ResourceTypeUnavailable', ex.message)
         self.assertIn('OS::Sahara::NodeGroupTemplate', ex.message)
diff --git a/scenario/templates/test_volumes_create_from_backup.yaml b/scenario/templates/test_volumes_create_from_backup.yaml
index d6eadd1..ab1edf8 100644
--- a/scenario/templates/test_volumes_create_from_backup.yaml
+++ b/scenario/templates/test_volumes_create_from_backup.yaml
@@ -8,7 +8,6 @@
   instance_type:
     type: string
     description: Type of the instance to be created.
-    default: m1.small
 
   image_id:
     type: string
diff --git a/scenario/templates/test_volumes_delete_snapshot.yaml b/scenario/templates/test_volumes_delete_snapshot.yaml
index 08f84f1..3893b52 100644
--- a/scenario/templates/test_volumes_delete_snapshot.yaml
+++ b/scenario/templates/test_volumes_delete_snapshot.yaml
@@ -8,7 +8,6 @@
   instance_type:
     type: string
     description: Type of the instance to be created.
-    default: m1.small
 
   image_id:
     type: string
diff --git a/scenario/test_volumes.py b/scenario/test_volumes.py
index 603c8f2..47e583d 100644
--- a/scenario/test_volumes.py
+++ b/scenario/test_volumes.py
@@ -46,7 +46,7 @@
         self.assertEqual(self.volume_description,
                          self._stack_output(stack, 'display_description'))
 
-    def check_stack(self, stack_id):
+    def check_stack(self, stack_id, parameters):
         stack = self.client.stacks.get(stack_id)
 
         # Verify with cinder that the volume exists, with matching details
@@ -75,6 +75,7 @@
         try:
             stack_identifier2 = self.launch_stack(
                 template_name='test_volumes_create_from_backup.yaml',
+                parameters=parameters,
                 add_parameters={'backup_id': backup.id})
             stack2 = self.client.stacks.get(stack_identifier2)
         except exceptions.StackBuildErrorException:
@@ -125,4 +126,4 @@
         )
 
         # Check stack
-        self.check_stack(stack_id)
+        self.check_stack(stack_id, parameters)