diff --git a/lib/fog/libvirt/requests/compute/create_volume.rb b/lib/fog/libvirt/requests/compute/create_volume.rb
index 269898406..0623ec369 100644
--- a/lib/fog/libvirt/requests/compute/create_volume.rb
+++ b/lib/fog/libvirt/requests/compute/create_volume.rb
@@ -8,7 +8,7 @@ module Fog
       end
 
       class Mock
-        def create_volume(xml)
+        def create_volume(pool_name, xml)
 
         end
       end
diff --git a/lib/fog/libvirt/requests/compute/list_volumes.rb b/lib/fog/libvirt/requests/compute/list_volumes.rb
index 822029fd8..af8723e06 100644
--- a/lib/fog/libvirt/requests/compute/list_volumes.rb
+++ b/lib/fog/libvirt/requests/compute/list_volumes.rb
@@ -20,7 +20,7 @@ module Fog
 
         def volume_to_attributes(vol)
 
-          format_type = xml_element(vol.xml_desc, "/volume/target/format", "type")
+          format_type = xml_element(vol.xml_desc, "/volume/target/format", "type") rescue nil # not all volumes have types, e.g. LVM
           return nil if format_type == "dir"
 
           {