diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6317f3ed26..b55230788a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2017-09-27  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-regs.c (tui_reg_command): Constify.
+
 2017-09-27  Tom Tromey  <tom@tromey.com>
 
 	* skip.c (skip_file_command, skip_function_command)
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index 838172e823..be735b368a 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -600,7 +600,7 @@ tui_reg_prev (struct gdbarch *gdbarch)
    not already on display.  */
 
 static void
-tui_reg_command (char *args, int from_tty)
+tui_reg_command (const char *args, int from_tty)
 {
   struct gdbarch *gdbarch = get_current_arch ();