diff --git a/drivers/platform/mellanox/mlxreg-io.c b/drivers/platform/mellanox/mlxreg-io.c
index 7646708d57e42bdc0ae57d2f0cdbf41bcc1a2fc2..a023ec02126b4ef7c9a1c9436887ab4bd3e20153 100644
--- a/drivers/platform/mellanox/mlxreg-io.c
+++ b/drivers/platform/mellanox/mlxreg-io.c
@@ -141,7 +141,7 @@ 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;