diff --git a/drivers/hwmon/f71882fg.c b/drivers/hwmon/f71882fg.c
index 70121482a617..27207ec6f7fe 100644
--- a/drivers/hwmon/f71882fg.c
+++ b/drivers/hwmon/f71882fg.c
@@ -1096,8 +1096,11 @@ static ssize_t show_pwm(struct device *dev,
 		val = data->pwm[nr];
 	else {
 		/* RPM mode */
-		val = 255 * fan_from_reg(data->fan_target[nr])
-			/ fan_from_reg(data->fan_full_speed[nr]);
+		if (fan_from_reg(data->fan_full_speed[nr]))
+			val = 255 * fan_from_reg(data->fan_target[nr])
+				/ fan_from_reg(data->fan_full_speed[nr]);
+		else
+			val = 0;
 	}
 	mutex_unlock(&data->update_lock);
 	return sprintf(buf, "%d\n", val);