diff --git a/pym/cl_builder.py b/pym/cl_builder.py
index a27d106..de3d91e 100644
--- a/pym/cl_builder.py
+++ b/pym/cl_builder.py
@@ -647,7 +647,7 @@ class cl_builder(color_print):
         self.printByResult(True)
         if self.clVars.Get('cl_builder_isohybrid_set') == 'on':
             self.printMessageForTest(_("Performing isohybrid"))
-            processIsoHybrid = process("/usr/bin/isohybrid",isoFile)
+            processIsoHybrid = process("/usr/bin/isohybrid","--uefi",isoFile)
             self.printByResult(processIsoHybrid.success())
         self.printMessageForTest(_("Generating the list of installed packages"))
         self.printByResult(self.createPackageList(sourceDirectory,