diff --git a/plugins/guests/coreos/guest.rb b/plugins/guests/coreos/guest.rb
index 4a349069a..cd7e76064 100644
--- a/plugins/guests/coreos/guest.rb
+++ b/plugins/guests/coreos/guest.rb
@@ -2,7 +2,7 @@ module VagrantPlugins
   module GuestCoreOS
     class Guest < Vagrant.plugin("2", :guest)
       def detect?(machine)
-        machine.communicate.test("cat /etc/gentoo-release | grep CoreOS || cat /etc/os-release | grep CoreOS")
+        machine.communicate.test("cat /etc/os-release | grep ID=coreos")
       end
     end
   end