diff --git a/.tmux.conf b/.tmux.conf
index 30e827f..464f671 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -10,6 +10,7 @@ bind-key j command-prompt -p "join pane from:"  "join-pane -s '%%'"
 bind-key s command-prompt -p "send pane to:"  "join-pane -t '%%'"
 
 # ssh socket, important to create symlink in ~/.ssh/rc
+set -g update-environment -r
 set-environment -g 'SSH_AUTH_SOCK' ~/.ssh/ssh_auth_sock
 
 # Shorten delay for relaying Esc (to e.g. vim). Too short and PgUp will not work