tmux jump words as with zsh

I moved from just using zsh to using zsh inside tmux. As my terminal is iTerm2 for both combinations. I have the following lines in my .zshrc to enable jumping words on a bare zsh command line using the ALT+arrow keys: bindkey 'C' forward-word bindkey '[D' backward-word Sadly this is not working inside my tmux session. > How can I jump words back and forth also in tmux using ALT + arrow > key? What I tried so far: 1. set-window-option -g xterm-keys on [1