diff --git a/herbstluftwm/.config/herbstluftwm/autostart b/herbstluftwm/.config/herbstluftwm/autostart
index e79d3c9..f84b9a3 100755
--- a/herbstluftwm/.config/herbstluftwm/autostart
+++ b/herbstluftwm/.config/herbstluftwm/autostart
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env zsh
 
 ## Helper functions:
 
@@ -133,20 +133,24 @@ hc keybind $Mod-u jumpto urgent
 
 ## Tags:
 tag_names=( dev web {3..10} )
+tag_indexes=( {1..${#tag_names}} )
 tag_keys=( bracketleft braceleft braceright parenleft equal
            asterisk parenright plus bracketright exclam )
 
-hc rename default "${tag_names[0]}" || true
-for i in "${!tag_names[@]}"; do
+hc rename default "${tag_names[1]}" || true
+for i in $tag_indexes; do
     hc add "${tag_names[$i]}"
     key="${tag_keys[$i]}"
     if ! [ -z "$key" ] ; then
+        # ZSH array indexes start at 1, herbstluftwm tag indexes start
+        # at zero, so subtract one to match them.
+        j=$(( $i - 1 ))
         # first check if the tag is locked to some monitor.
         # if so, first focus the monitor
         hc keybind "$Mod-$key" chain \
-           , silent substitute M tags."$i".my-monitor focus_monitor M \
-           , use_index "$i"
-        hc keybind "$Mod-Shift-$key" move_index "$i"
+           , silent substitute M tags."$j".my-monitor focus_monitor M \
+           , use_index "$j"
+        hc keybind "$Mod-Shift-$key" move_index "$j"
     fi
 done