diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a9bd5452d6f..4dbe3ed79c3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2017-09-27  Tom Tromey  <tom@tromey.com>
+
+	* cp-namespace.c (maintenance_cplus_namespace): Constify.
+
 2017-09-27  Tom Tromey  <tom@tromey.com>
 
 	* cp-support.c (first_component_command): Constify.
diff --git a/gdb/cp-namespace.c b/gdb/cp-namespace.c
index 90ff5139543..214b7e1cf4e 100644
--- a/gdb/cp-namespace.c
+++ b/gdb/cp-namespace.c
@@ -1078,7 +1078,7 @@ cp_lookup_transparent_type_loop (const char *name,
    obsolete.  */
 
 static void
-maintenance_cplus_namespace (char *args, int from_tty)
+maintenance_cplus_namespace (const char *args, int from_tty)
 {
   printf_unfiltered (_("The `maint namespace' command was removed.\n"));
 }