diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index 23021b7..edcb336 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -231,7 +231,7 @@ GIT_ARCHIVE="${DIST_ARCHIVE_BASE}/${DISTNAME}.tar.gz"
 if [ ! -e "$GIT_ARCHIVE" ]; then
     mkdir -p "$(dirname "$GIT_ARCHIVE")"
     git rev-parse --short=12 HEAD > githash.txt
-    ( git ls-files --recurse-submodules ; echo "githash.txt" ) | cat | tar --transform 's,^,$DISTNAME/,' -caf ${GIT_ARCHIVE} -T-
+    ( git ls-files --recurse-submodules ; echo "githash.txt" ) | cat | tar --transform "s,^,${DISTNAME}/," -caf ${GIT_ARCHIVE} -T-
     sha256sum "$GIT_ARCHIVE"
 fi