diff --git a/config/tmux/tmux.conf b/config/tmux/tmux.conf
index 7e38fb1f..11c75203 100644
--- a/config/tmux/tmux.conf
+++ b/config/tmux/tmux.conf
@@ -77,7 +77,7 @@ setw -g aggressive-resize on
 set -g detach-on-destroy off
 set -g extended-keys on
 set -g extended-keys-format csi-u
-set -g terminal-features[3] "xterm-kitty:extkeys"
+set -ag terminal-features "xterm-kitty:extkeys"
 set -as terminal-features ",*:clipboard"
 set -sg escape-time 10