diff --git a/dot_config/fish/conf.d/tmux.fish b/dot_config/fish/conf.d/tmux.fish
new file mode 100644
index 0000000..e2ef16a
--- /dev/null
+++ b/dot_config/fish/conf.d/tmux.fish
@@ -0,0 +1,7 @@
+if status is-interactive
+    and not set -q TMUX
+    if command -v tmux > /dev/null
+        exec tmux new-session -As base
+    end
+end
+