diff --git a/src/vnm_mad/OpenNebulaNetwork.rb b/src/vnm_mad/OpenNebulaNetwork.rb
index 0d1a6154d4..a05248d3dc 100644
--- a/src/vnm_mad/OpenNebulaNetwork.rb
+++ b/src/vnm_mad/OpenNebulaNetwork.rb
@@ -79,7 +79,11 @@ class OpenNebulaNetwork
     attr_reader :hypervisor, :vm
 
     def initialize(vm_tpl, hypervisor=nil)
-        @hypervisor = detect_hypervisor if !hypervisor
+        if !hypervisor
+            @hypervisor = detect_hypervisor 
+        else
+            @hypervisor = hypervisor
+        end
         @vm      = VM.new(REXML::Document.new(vm_tpl).root, @hypervisor)
     end