(Fsubstitute_command_keys): Cast arg of describe_map_tree.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/doc.c b/src/doc.c
index 07dd80aaee2..f022396eff3 100644
--- a/src/doc.c
+++ b/src/doc.c
@@ -661,7 +661,7 @@ thus, \\=\\=\\=\\= puts \\=\\= into the output, and \\=\\=\\=\\[ puts \\=\\[ int
           else if (start[-1] == '<')
             keymap = tem;
           else
-            describe_map_tree (tem, 1, Qnil, Qnil, 0, 1);
+            describe_map_tree (tem, 1, Qnil, Qnil, (char *)0, 1);
           tem = Fbuffer_string ();
           Ferase_buffer ();
           set_buffer_internal (oldbuf);