diff --git a/hooks/002-setup_user.chroot b/hooks/002-setup_user.chroot
index ad07b0e1..c18f434e 100755
--- a/hooks/002-setup_user.chroot
+++ b/hooks/002-setup_user.chroot
@@ -25,7 +25,7 @@ done
 
 # Enable libnss-extrusers
 sed -i 's/^passwd:.*files/\0 extrausers/' /etc/nsswitch.conf
-sed -i 's/^group:.*files/\0 extrausers/' /etc/nsswitch.conf
+sed -i 's/^group:.*files/\0 [SUCCESS=merge] extrausers/' /etc/nsswitch.conf
 sed -i 's/^shadow:.*files/\0 extrausers/' /etc/nsswitch.conf
 
 # Enable pam configuration for extrausers