diff --git a/app/assets/javascripts/player/vt.js.coffee b/app/assets/javascripts/player/vt.js.coffee
index fe6d3e1..60e28fb 100644
--- a/app/assets/javascripts/player/vt.js.coffee
+++ b/app/assets/javascripts/player/vt.js.coffee
@@ -462,7 +462,7 @@ class AsciiIo.VT
       @updateLine()
 
   _cursorRight: ->
-    if @cursorX < @cols
+    if @cursorX < @cols - 1
       @cursorX += 1
       @updateLine()