diff --git a/jenkins/scripts/wheel-index.sh b/jenkins/scripts/wheel-index.sh
index 5473ed98f0..e34de1780d 100755
--- a/jenkins/scripts/wheel-index.sh
+++ b/jenkins/scripts/wheel-index.sh
@@ -4,7 +4,7 @@
 MIRROR_ROOT=$1
 
 # A temporary file to which to write the new index
-TMP_INDEX_FILE=$(tempfile)
+TMP_INDEX_FILE=$(mktemp)
 trap "rm -f -- '$TMP_INDEX_FILE'" EXIT
 
 # And the final location