diff --git a/doc/developer.texi b/doc/developer.texi
index 60f6d054dac5193ea2ae78971ab2fa2ddc7083ed..ae9609dae67c3f9a6ecd44fe4099634bcff7effd 100644
--- a/doc/developer.texi
+++ b/doc/developer.texi
@@ -235,8 +235,8 @@ For Emacs, add these roughly equivalent lines to your @file{.emacs.d/init.el}:
 (c-add-style "libav"
              '("k&r"
                (c-basic-offset . 4)
-               (indent-tabs-mode nil)
-               (show-trailing-whitespace t)
+               (indent-tabs-mode . nil)
+               (show-trailing-whitespace . t)
                (c-offsets-alist
                 (statement-cont . (c-lineup-assignments +)))
                )