diff --git a/lib/program.js b/lib/program.js
index 3a6a5f0..c9b956b 100644
--- a/lib/program.js
+++ b/lib/program.js
@@ -3134,6 +3134,8 @@ Program.prototype.tmux = {
   },
 
   get panes() {
+    return 1; // doesn't seem to matter
+
     var panes = -1;
     if (!this.used) return panes;