diff --git a/v2v/convert_linux.ml b/v2v/convert_linux.ml
index b432fdd47..f1a710d60 100644
--- a/v2v/convert_linux.ml
+++ b/v2v/convert_linux.ml
@@ -173,10 +173,10 @@ let convert (g : G.guestfs) inspect source output rcaps =
       (try
          let lines = g#read_lines "/etc/rc.local" in
          let lines = Array.to_list lines in
-         let rex = Str.regexp ".*\\b\\(insmod|modprobe\\)\b.*\\bxen-vbd.*" in
+         let rex = PCRE.compile "\\b(insmod|modprobe)\\b.*\\bxen-vbd" in
          let lines = List.map (
            fun s ->
-             if Str.string_match rex s 0 then
+             if PCRE.matches rex s then
                "#" ^ s
              else
                s