diff --git a/vimconn_openvim.py b/vimconn_openvim.py
index d415532..241f63d 100644
--- a/vimconn_openvim.py
+++ b/vimconn_openvim.py
@@ -776,7 +776,7 @@
             #print text
             return -vim_response.status_code,text
 
-    def new_vminstance(self,name,description,start,image_id,flavor_id,net_list, cloud_config=None):
+    def new_vminstance(self,name,description,start,image_id,flavor_id,net_list, cloud_config=None, disk_list=None):
         '''Adds a VM instance to VIM
         Params:
             start: indicates if VM must start or boot in pause mode. Ignored