diff --git a/drivers/platform/mellanox/mlxreg-io.c b/drivers/platform/mellanox/mlxreg-io.c
index acfaf64ffde6..1c3760c13f83 100644
--- a/drivers/platform/mellanox/mlxreg-io.c
+++ b/drivers/platform/mellanox/mlxreg-io.c
@@ -123,7 +123,7 @@ mlxreg_io_attr_store(struct device *dev, struct device_attribute *attr,
 		return -EINVAL;
 
 	/* Convert buffer to input value. */
-	ret = kstrtou32(buf, len, &input_val);
+	ret = kstrtou32(buf, 0, &input_val);
 	if (ret)
 		return ret;