1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/diff-mode.el b/lisp/diff-mode.el
index 28ad437f15d..a83200d8982 100644
--- a/lisp/diff-mode.el
+++ b/lisp/diff-mode.el
@@ -184,7 +184,7 @@ when editing big diffs)."
      :help "Convert unified diffs to context diffs"]
     ;;["Fixup Headers"          diff-fixup-modifs       (not buffer-read-only)]
     ["Show trailing whitespace" whitespace-mode
-     :style toggle :selected (and (boundp 'whitespace-mode) whitespace-mode)
+     :style toggle :selected (bound-and-true-p whitespace-mode)
      :help "Show trailing whitespace in modified lines"]
     "-----"
     ["Split hunk"               diff-split-hunk