The replacement string was wrong. There are only two match groups in the regular expression, not three. Signed-off-by: Tomáš Golembiovský <tgolembi(a)redhat.com&gt; --- v2v/convert_linux.ml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/v2v/convert_linux.ml b/v2v/convert_linux.ml index 06943cd..4b1ce99 100644 --- a/v2v/convert_linux.ml +++ b/v2v/convert_linux.ml @@ -1057,9 +1057,9 @@ let rec convert ~keep_serial_console (g : G.guestfs) inspect source rcaps = if Str.string_match rex grub_cmdline 0 then ( let new_grub_cmdline = if not remove then - Str.global_replace rex "\\1console=ttyS0\\3" grub_cmdline + Str.global_replace rex "\\1console=ttyS0\\2" grub_cmdline else - Str.global_replace rex "\\1\\3" grub_cmdline in + Str.global_replace rex "\\1\\2" grub_cmdline in g#aug_set path new_grub_cmdline; g#aug_save (); -- 2.9.2