diff --git a/src/oca/ruby/opennebula/virtual_machine.rb b/src/oca/ruby/opennebula/virtual_machine.rb
index fa816aa003..5a60c20432 100644
--- a/src/oca/ruby/opennebula/virtual_machine.rb
+++ b/src/oca/ruby/opennebula/virtual_machine.rb
@@ -222,6 +222,8 @@ module OpenNebula
         # @return [nil, OpenNebula::Error] nil in case of success, Error
         #   otherwise
         def deploy(host_id, enforce=false, ds_id=-1)
+            enforce ||= false
+            ds_id ||= -1
             return call(VM_METHODS[:deploy], @pe_id, host_id.to_i, enforce, ds_id.to_i)
         end