diff --git a/nova_powervm/virt/powervm/driver.py b/nova_powervm/virt/powervm/driver.py
index 6c55b44b..0db99bce 100644
--- a/nova_powervm/virt/powervm/driver.py
+++ b/nova_powervm/virt/powervm/driver.py
@@ -751,12 +751,14 @@ class PowerVMDriver(driver.ComputeDriver):
         # to revise in the future as volume connectors evolve.
         instance.save()
 
-    def extend_volume(self, connection_info, instance):
+    def extend_volume(self, connection_info, instance, requested_size):
         """Extend the disk attached to the instance.
 
         :param dict connection_info: The connection for the extended volume.
         :param nova.objects.instance.Instance instance:
             The instance whose volume gets extended.
+        :param int requested_size: The requested new volume size in bytes. This
+            parameter is unused by this driver.
         :return: None
         """
         vol_drv = vol_attach.build_volume_driver(