diff --git a/sound/isa/es1688/es1688_lib.c b/sound/isa/es1688/es1688_lib.c
index 81cf26fa28d60427d4280b0ba43e3a6576ac7fa1..5d3df96c5e5bc8dc12908f41601af5e80bcc6279 100644
--- a/sound/isa/es1688/es1688_lib.c
+++ b/sound/isa/es1688/es1688_lib.c
@@ -290,7 +290,7 @@ static int snd_es1688_init(struct snd_es1688 * chip, int enable)
 
  */
 
-static struct snd_ratnum clocks[2] = {
+static const struct snd_ratnum clocks[2] = {
 	{
 		.num = 795444,
 		.den_min = 1,
@@ -305,7 +305,7 @@ static struct snd_ratnum clocks[2] = {
 	}
 };
 
-static struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks  = {
+static const struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks  = {
 	.nrats = 2,
 	.rats = clocks,
 };