diff --git a/clipetty.el b/clipetty.el
index cb24eec..fd76568 100644
--- a/clipetty.el
+++ b/clipetty.el
@@ -139,7 +139,7 @@ Optionally base64 encode it first if you specify non-nil for ENCODE."
   "Emit STRING, optionally wrapped in a DCS, to an appropriate tty."
   (let ((tmux    (getenv "TMUX" (selected-frame)))
         (term    (getenv "TERM" (selected-frame)))
-        (ssh-tty (getenv "SSH_TTY" (selected-frame))))
+        (ssh-tty (if (getenv "TMUX" (selected-frame)) nil (getenv "SSH_TTY" (selected-frame))))) ; under TMUX SSH_TTY can get stale on reconnect
     (if (<= (length string) clipetty--max-cut)
         (write-region
          (clipetty--dcs-wrap string tmux term ssh-tty)