diff --git util/mumamo.el util/mumamo.el
index 9c16ce9..8e6eb7f 100644
--- util/mumamo.el
+++ util/mumamo.el
@@ -491,7 +491,7 @@ See also `mumamo-chunk-value-set-min'."
          (major   (mumamo-chunk-major-mode chunk)))
     ;;(msgtrc "keyboard-major-mode cmin=%s pos=%s cmax=%s" cmin pos cmax)
     (unless (and (<= cmin pos)
-                 (< pos cmax))
+                 (<= pos cmax))
       (setq major 'mumamo-border-mode))
     major))