diff --git a/tests/reftests/admin-cache.test b/tests/reftests/admin-cache.test
index 83fd11b7c83..af344519b90 100644
--- a/tests/reftests/admin-cache.test
+++ b/tests/reftests/admin-cache.test
@@ -260,8 +260,8 @@ amet : sha512 : exists
 ### <sedi.sh>
 regexp=$1
 file=$2
-sed "$regexp" $file > $file.tmp
-mv $file.tmp $file
+sed "$regexp" "$file" > "$file.tmp"
+mv "$file.tmp" "$file"
 ### sh sedi.sh '/"sha512=.*/d' packages/ipsum/ipsum.1/opam
 ### sh sedi.sh '/"sha256=.*/d' packages/ipsum/ipsum.1/opam
 ### sh sedi.sh '/"sha512=.*/d' packages/dolor/dolor.1/opam