diff --git a/controls/os_spec.rb b/controls/os_spec.rb
index 09367de..65a065f 100644
--- a/controls/os_spec.rb
+++ b/controls/os_spec.rb
@@ -210,7 +210,11 @@
     its(:content) { should match 'install hfsplus /bin/true' }
     its(:content) { should match 'install squashfs /bin/true' }
     its(:content) { should match 'install udf /bin/true' }
-    its(:content) { should match 'install vfat /bin/true' }
+    # if efi is active, do not disable vfat. otherwise the system
+    # won't boot anymore
+    unless Dir.exist?('/sys/firmware/efi')
+      its(:content) { should match 'install vfat /bin/true' }
+    end
   end
 end