diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index e7f325ced940..2e0e6432901b 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -12,6 +12,7 @@
 
 #include <linux/bcd.h>
 #include <linux/i2c.h>
+#include <linux/kstrtox.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/rtc.h>
diff --git a/drivers/rtc/rtc-bq32k.c b/drivers/rtc/rtc-bq32k.c
index 6d6a55efb9cc..967ddc6bf76d 100644
--- a/drivers/rtc/rtc-bq32k.c
+++ b/drivers/rtc/rtc-bq32k.c
@@ -13,6 +13,7 @@
 #include <linux/i2c.h>
 #include <linux/rtc.h>
 #include <linux/init.h>
+#include <linux/kstrtox.h>
 #include <linux/errno.h>
 #include <linux/bcd.h>
 
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index d51565bcc189..7c2276cf5514 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -11,6 +11,7 @@
 #include <linux/bcd.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
+#include <linux/kstrtox.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/property.h>
diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
index eb483a30bd92..e4fdd47ae066 100644
--- a/drivers/rtc/rtc-rv3029c2.c
+++ b/drivers/rtc/rtc-rv3029c2.c
@@ -17,6 +17,7 @@
 #include <linux/of.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
+#include <linux/kstrtox.h>
 #include <linux/regmap.h>
 
 /* Register map */
diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c
index 77d3cb08b5ec..331c20d4d843 100644
--- a/drivers/rtc/rtc-rx8025.c
+++ b/drivers/rtc/rtc-rx8025.c
@@ -19,6 +19,7 @@
 #include <linux/bitops.h>
 #include <linux/i2c.h>
 #include <linux/kernel.h>
+#include <linux/kstrtox.h>
 #include <linux/module.h>
 #include <linux/rtc.h>
 
diff --git a/drivers/rtc/sysfs.c b/drivers/rtc/sysfs.c
index 00f1945bcb7e..e3062c4d3f2c 100644
--- a/drivers/rtc/sysfs.c
+++ b/drivers/rtc/sysfs.c
@@ -6,6 +6,7 @@
  * Author: Alessandro Zummo <a.zummo@towertech.it>
  */
 
+#include <linux/kstrtox.h>
 #include <linux/module.h>
 #include <linux/rtc.h>