diff --git a/RO-plugin/osm_ro_plugin/vim_dummy.py b/RO-plugin/osm_ro_plugin/vim_dummy.py
index 6c59607..fbc6bfe 100644
--- a/RO-plugin/osm_ro_plugin/vim_dummy.py
+++ b/RO-plugin/osm_ro_plugin/vim_dummy.py
@@ -424,7 +424,7 @@
 
         return self.vms[vm_id]
 
-    def delete_vminstance(self, vm_id, created_items=None):
+    def delete_vminstance(self, vm_id, created_items=None, volumes_to_hold=None):
         if vm_id not in self.vms:
             raise vimconn.VimConnNotFoundException(
                 "vm with id {} not found".format(vm_id)
diff --git a/RO-plugin/osm_ro_plugin/vimconn.py b/RO-plugin/osm_ro_plugin/vimconn.py
index 20ab3a3..bb06037 100644
--- a/RO-plugin/osm_ro_plugin/vimconn.py
+++ b/RO-plugin/osm_ro_plugin/vimconn.py
@@ -661,7 +661,7 @@
         """Returns the VM instance information from VIM"""
         raise VimConnNotImplemented("Should have implemented this")
 
-    def delete_vminstance(self, vm_id, created_items=None):
+    def delete_vminstance(self, vm_id, created_items=None, volumes_to_hold=None):
         """
         Removes a VM instance from VIM and its associated elements
         :param vm_id: VIM identifier of the VM, provided by method new_vminstance