diff --git a/action.yml b/action.yml
index b9a560e..b363e99 100644
--- a/action.yml
+++ b/action.yml
@@ -106,7 +106,7 @@ runs:
           sleep 1
 
           TMUX_TTY=$(tmux list-panes -t test-session -F "#{pane_tty}")
-          echo "TMUX_TTY=$TMUX_TTY" >> $GITHUB_ENV
+          echo "$TMUX_TTY" > tmux_tty.txt
 
           tmux wait-for done
         else