diff --git a/tmux_rattach.sh b/tmux_rattach.sh
index 321832a..83b48a9 100755
--- a/tmux_rattach.sh
+++ b/tmux_rattach.sh
@@ -2,4 +2,9 @@
 
 # Crée ou attache une session tmux
 export TERM="xterm-256color"
-tmux attach || tmux new
+if tmux has 2> /dev/null
+then
+  exec tmux attach
+else
+  exec tmux new
+fi