diff --git a/drivers/extcon/extcon-max77804k.c b/drivers/extcon/extcon-max77804k.c
index 2c8119d430f..9ecdf5c6e10 100644
--- a/drivers/extcon/extcon-max77804k.c
+++ b/drivers/extcon/extcon-max77804k.c
@@ -1056,7 +1056,7 @@ void max77804k_muic_send_event(int val)
 	kobject_uevent_env(&gInfo->dev->kobj, KOBJ_CHANGE, envp);
 }
 
-extern int system_rev;
+extern unsigned int system_rev;
 
 #if defined(CONFIG_MUIC_DET_JACK)
 static void max77804k_muic_earjack_detect_workfunc(struct work_struct *work)
diff --git a/drivers/input/touchscreen/synaptics/synaptics_i2c_rmi.h b/drivers/input/touchscreen/synaptics/synaptics_i2c_rmi.h
index dabb86a40f7..2b46f4568e6 100644
--- a/drivers/input/touchscreen/synaptics/synaptics_i2c_rmi.h
+++ b/drivers/input/touchscreen/synaptics/synaptics_i2c_rmi.h
@@ -557,7 +557,7 @@
 #endif
 
 
-extern int system_rev;
+extern unsigned int system_rev;
 
 struct synaptics_rmi4_f01_device_status {
 	union {
diff --git a/include/linux/sii8240.h b/include/linux/sii8240.h
index a628b15f7a5..5302a95d3ac 100644
--- a/include/linux/sii8240.h
+++ b/include/linux/sii8240.h
@@ -110,7 +110,7 @@ struct sii8240_platform_data {
 	bool is_smartdock;
 #endif
 };
-extern int system_rev;
+extern unsigned int system_rev;
 int acc_register_notifier(struct notifier_block *nb);
 #endif /* __SII8240_H__ */