* ibuffer.el (ibuffer-sort-bufferlist): Require ibuf-ext

  if the sorting functions are not loaded.  (Bug#1432)

1 files changed, 3 insertions, 0 deletions

diff --git a/lisp/ibuffer.el b/lisp/ibuffer.el
index 262f2ad73ab..2aeaf7e1111 100644
--- a/lisp/ibuffer.el
+++ b/lisp/ibuffer.el
@@ -2191,6 +2191,9 @@ If optional arg SILENT is non-nil, do not display progress messages."
              ibuffer-header-line-format)))
 
 (defun ibuffer-sort-bufferlist (bmarklist)
+  (unless ibuffer-sorting-functions-alist
+    ;; make sure the sorting functions are loaded
+    (require 'ibuf-ext))
   (let* ((sortdat (assq ibuffer-sorting-mode
                         ibuffer-sorting-functions-alist))
          (func (caddr sortdat)))