diff --git a/lib/defaults.vim b/lib/defaults.vim
new file mode 100644
index 000000000..e118085cc
--- /dev/null
+++ b/lib/defaults.vim
@@ -0,0 +1,3 @@
+# Default applications
+
+IRC=($commands[weechat-curses] $commands[irssi])
diff --git a/plugins/tmux/tmux.plugin.zsh b/plugins/tmux/tmux.plugin.zsh
index 76f688cf2..eb13a7603 100644
--- a/plugins/tmux/tmux.plugin.zsh
+++ b/plugins/tmux/tmux.plugin.zsh
@@ -1,8 +1,13 @@
-# TODO: move elsewhere
-IRC=($commands[weechat-curses] $commands[irssi])
+# Enable autostarting of tmux with:
+#
+#   zstyle :omz:plugins:tmux autostart on
+#
 
 if (( $+commands[tmux] )); then
-  [[ -z $TMUX ]] && exec tmux
+  local state
+
+  zstyle -a :omz:plugins:autostart state
+  [[ state == "on" && -z $TMUX ]] && exec tmux
 
   if [[ -n $IRC ]]; then
     irc() {