diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 23ab3c4..1672e2a 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -29,6 +29,7 @@
 #include <linux/kdev_t.h>
 #include <linux/sched.h>
 #include <linux/time.h>
+#include <linux/err.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/acpi_bus.h>
 
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 8f3f6f2..b41baff 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -43,6 +43,7 @@
 #include <linux/leds.h>
 #include <linux/hwmon.h>
 #include <linux/workqueue.h>
+#include <linux/err.h>
 
 /* data port used by Apple SMC */
 #define APPLESMC_DATA_PORT	0x300
diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c
index c74b1d9..56dbcfb 100644
--- a/drivers/hwmon/asus_atk0110.c
+++ b/drivers/hwmon/asus_atk0110.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/dmi.h>
 #include <linux/jiffies.h>
+#include <linux/err.h>
 
 #include <acpi/acpi.h>
 #include <acpi/acpixf.h>
diff --git a/drivers/hwmon/ibmaem.c b/drivers/hwmon/ibmaem.c
index 37f17e0..a14f634 100644
--- a/drivers/hwmon/ibmaem.c
+++ b/drivers/hwmon/ibmaem.c
@@ -36,6 +36,7 @@
 #include <linux/platform_device.h>
 #include <linux/math64.h>
 #include <linux/time.h>
+#include <linux/err.h>
 
 #define REFRESH_INTERVAL	(HZ)
 #define IPMI_TIMEOUT		(30 * HZ)
diff --git a/drivers/hwmon/ibmpex.c b/drivers/hwmon/ibmpex.c
index 41dbf81..b622a93 100644
--- a/drivers/hwmon/ibmpex.c
+++ b/drivers/hwmon/ibmpex.c
@@ -26,6 +26,7 @@
 #include <linux/jiffies.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/err.h>
 
 #define REFRESH_INTERVAL	(2 * HZ)
 #define DRVNAME			"ibmpex"
diff --git a/drivers/hwmon/ultra45_env.c b/drivers/hwmon/ultra45_env.c
index c315c59..44136bb 100644
--- a/drivers/hwmon/ultra45_env.c
+++ b/drivers/hwmon/ultra45_env.c
@@ -12,6 +12,7 @@
 #include <linux/io.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
 
 #define DRV_MODULE_VERSION	"0.1"