diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 9eda2f84a3cf9863f1a6fcf1bfaec486f2abcc1e..4864a5c189d464a9ef4327416a7f9d0ae1aaca34 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -9633,13 +9633,13 @@ static ssize_t charge_control_end_threshold_store(struct device *dev,
 
 static DEVICE_ATTR_RW(charge_control_start_threshold);
 static DEVICE_ATTR_RW(charge_control_end_threshold);
-struct device_attribute dev_attr_charge_start_threshold = __ATTR(
+static struct device_attribute dev_attr_charge_start_threshold = __ATTR(
 	charge_start_threshold,
 	0644,
 	charge_control_start_threshold_show,
 	charge_control_start_threshold_store
 );
-struct device_attribute dev_attr_charge_stop_threshold = __ATTR(
+static struct device_attribute dev_attr_charge_stop_threshold = __ATTR(
 	charge_stop_threshold,
 	0644,
 	charge_control_end_threshold_show,