diff --git a/bin/list-all b/bin/list-all
index 76474f1..bd122f0 100755
--- a/bin/list-all
+++ b/bin/list-all
@@ -15,7 +15,7 @@ list_all() {
   fi
 
   $(perl_install_bin) $list_arg |
-    if which tac >/dev/null; then
+    if type tac >/dev/null; then
       tac
     else
       tail -r