diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8aa6b13c3f..32d1ee2c41 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2017-09-27  Tom Tromey  <tom@tromey.com>
+
+	* reggroups.c (maintenance_print_reggroups): Constify.
+
 2017-09-27  Tom Tromey  <tom@tromey.com>
 
 	* dwarf2read.c (save_gdb_index_command): Constify.
diff --git a/gdb/reggroups.c b/gdb/reggroups.c
index 512fe11b11..2ecd0b494f 100644
--- a/gdb/reggroups.c
+++ b/gdb/reggroups.c
@@ -262,7 +262,7 @@ reggroups_dump (struct gdbarch *gdbarch, struct ui_file *file)
 }
 
 static void
-maintenance_print_reggroups (char *args, int from_tty)
+maintenance_print_reggroups (const char *args, int from_tty)
 {
   struct gdbarch *gdbarch = get_current_arch ();