diff --git a/cdist/conf/type/__jail/manifest b/cdist/conf/type/__jail/manifest
index 6fb4a306..adf9bd99 100755
--- a/cdist/conf/type/__jail/manifest
+++ b/cdist/conf/type/__jail/manifest
@@ -43,8 +43,7 @@ for property in *; do
 	set -- "$@" "--$property" "$(cat "$property")"
 done
 
-ver="$(cat "$__global/explorer/os_version")"
-if echo "$ver" | grep -q '^10\.'; then   # Version is 10.x
+if grep -q '^10\.' "$(cat "$__global/explorer/os_version")" ; then   # Version is 10.x
    __jail_freebsd10 "$@"
 else
    __jail_freebsd9 "$@"