diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 11c20d8a08..74e805db12 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2017-09-27  Tom Tromey  <tom@tromey.com>
+
+	* cp-abi.c (set_cp_abi_cmd, show_cp_abi_cmd): Constify.
+
 2017-09-27  Tom Tromey  <tom@tromey.com>
 
 	* arc-tdep.c (dump_arc_instruction_command): Constify.
diff --git a/gdb/cp-abi.c b/gdb/cp-abi.c
index 49fab32561..11b8424856 100644
--- a/gdb/cp-abi.c
+++ b/gdb/cp-abi.c
@@ -341,7 +341,7 @@ list_cp_abis (int from_tty)
    argument is given.  */
 
 static void
-set_cp_abi_cmd (char *args, int from_tty)
+set_cp_abi_cmd (const char *args, int from_tty)
 {
   if (args == NULL)
     {
@@ -378,7 +378,7 @@ cp_abi_completer (struct cmd_list_element *ignore,
 /* Show the currently selected C++ ABI.  */
 
 static void
-show_cp_abi_cmd (char *args, int from_tty)
+show_cp_abi_cmd (const char *args, int from_tty)
 {
   struct ui_out *uiout = current_uiout;