1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/faces.el b/lisp/faces.el
index 8b0741658ff..7877a26db52 100644
--- a/lisp/faces.el
+++ b/lisp/faces.el
@@ -1048,7 +1048,7 @@ selected frame."
         (invert-face face frame)
       (let (done)
         (while (and colors (not done))
-          (if (or (eq (car colors) t)
+          (if (or (memq (car colors) '(t underline))
                   (face-color-supported-p frame (car colors)
                                           (eq function 'set-face-background)))
               (if (cdr colors)