diff --git a/bashrc b/bashrc
index 2622521..47368af 100755
--- a/bashrc
+++ b/bashrc
@@ -381,7 +381,7 @@ mkcd(){
     cd $1
 }
 
-if null type reattach-to-user-namespace
+if test -n "$TMUX" && null type reattach-to-user-namespace
 then
     alias pbpaste="reattach-to-user-namespace pbpaste"
     alias pbcopy="reattach-to-user-namespace pbcopy"
diff --git a/emacs.el b/emacs.el
index 9f1db5f..25b32cc 100644
--- a/emacs.el
+++ b/emacs.el
@@ -609,6 +609,7 @@ otherwise the path where the library installed."
       t)
      (require 'pasteboard nil t)
      (turn-on-pasteboard)
+     (getenv "TMUX")
      (pasteboard-enable-rtun))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;