diff --git a/files/apts/n-cpu b/files/apts/n-cpu
index b287107..a82304d 100644
--- a/files/apts/n-cpu
+++ b/files/apts/n-cpu
@@ -5,4 +5,4 @@
 genisoimage
 sysfsutils
 sg3-utils
-python-guestfs
+python-guestfs # NOPRIME