diff --git a/start_tmux.sh b/start_tmux.sh
index eabaf1b..74689a9 100755
--- a/start_tmux.sh
+++ b/start_tmux.sh
@@ -1,3 +1,6 @@
 #!/bin/bash
-tmux new-session -s ansible-devspace -d
-tmux attach -t ansible-devspace
+## check interactive shell https://unix.stackexchange.com/questions/26676/how-to-check-if-a-shell-is-login-interactive-batch
+if [[ $- == *i* ]] ; then
+  tmux new-session -s ansible-devspace -d
+  tmux attach -t ansible-devspace
+fi