diff --git a/.config/tmux/tmux.conf b/.config/tmux/tmux.conf
index d9b3fde..35607c5 100644
--- a/.config/tmux/tmux.conf
+++ b/.config/tmux/tmux.conf
@@ -4,6 +4,10 @@
 set -g extended-keys on
 set -g extended-keys-format csi-u
 
+# Use 256-colour tmux terminfo and advertise truecolour support to apps.
+set -g default-terminal "tmux-256color"
+set -as terminal-features ",*:RGB"
+
 # Keep a large scrollback history.
 set -g history-limit 1000000