diff --git a/.tmux.conf b/.tmux.conf
index 87f2aa4..f1aa6c2 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -128,6 +128,13 @@ bind-key -T copy-mode-vi 'C-l' select-pane -R
 bind-key -T copy-mode-vi 'C-\' select-pane -l
 
 
+# Clipboard (OSC 52)
+# Required for nested tmux (local tmux -> ssh/mosh -> remote tmux): the inner
+# tmux sends its copies up as OSC 52, and tmux only accepts OSC 52 coming
+# from a pane when set-clipboard is "on". The default "external" drops it.
+set -g set-clipboard on
+set -as terminal-features ',*:clipboard'
+
 #
 # Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
 run '~/.tmux/plugins/tpm/tpm'