diff --git a/drivers/i2c/algos/i2c-algo-pcf.c b/drivers/i2c/algos/i2c-algo-pcf.c
index 5b24930..3b20033 100644
--- a/drivers/i2c/algos/i2c-algo-pcf.c
+++ b/drivers/i2c/algos/i2c-algo-pcf.c
@@ -458,7 +458,7 @@
 
 /* -----exported algorithm data: -------------------------------------	*/
 
-static struct i2c_algorithm pcf_algo = {
+static const struct i2c_algorithm pcf_algo = {
 	.master_xfer	= pcf_xfer,
 	.functionality	= pcf_func,
 };