diff --git a/wiki/src/contribute/release_process.mdwn b/wiki/src/contribute/release_process.mdwn
index a5151b350c90d9daa5f613aaf87a23d55ca06dc4..53d456bf387a1f01322802e38837b5f78acfd9dc 100644
--- a/wiki/src/contribute/release_process.mdwn
+++ b/wiki/src/contribute/release_process.mdwn
@@ -95,7 +95,7 @@ Also export the following environment variables:
 * `RELEASE_CHECKOUT`: a checkout of the branch of the main Tails Git
   repository used to prepare the release (`stable` or `testing`).
 * `TAILS_SIGNATURE_KEY=A490D0F4D311A4153E2BB7CADBB802B258ACD84F`
-* `TAILS_SIGNATURE_KEY_LONG_ID=$(echo "${TAILS_SIGNATURE_KEY:?}"perl -nE 'say substr($_, -17)')`
+* `TAILS_SIGNATURE_KEY_LONG_ID=$(echo "${TAILS_SIGNATURE_KEY:?}" | perl -nE 'say substr($_, -17)')`
 * `IUK_CHECKOUT`: a checkout of the relevant tag of the `iuk`
   Git repository.
 * `PERL5LIB_CHECKOUT`: a checkout of the relevant tag of the