diff --git a/firmware/target/arm/imx233/lradc-imx233.c b/firmware/target/arm/imx233/lradc-imx233.c
index 1101e3d32d..8b065bffea 100644
--- a/firmware/target/arm/imx233/lradc-imx233.c
+++ b/firmware/target/arm/imx233/lradc-imx233.c
@@ -177,12 +177,14 @@ int imx233_lradc_sense_die_temperature(int nmos_chan, int pmos_chan)
     return (diff * 1012) / 4000;
 }
 
-void imx233_lradc_setup_battery_conversion(bool automatic, int scale_factor)
+void imx233_lradc_setup_battery_conversion(bool automatic, unsigned long scale_factor)
 {
-    __REG_CLR(HW_LRADC_CONVERSION) = HW_LRADC_CONVERSION__AUTOMATIC |
-        HW_LRADC_CONVERSION__SCALE_FACTOR_BM;
-    __REG_SET(HW_LRADC_CONVERSION) = scale_factor |
-        automatic ? HW_LRADC_CONVERSION__AUTOMATIC : 0;
+    __REG_CLR(HW_LRADC_CONVERSION) = HW_LRADC_CONVERSION__SCALE_FACTOR_BM;
+    __REG_SET(HW_LRADC_CONVERSION) = scale_factor;
+    if(automatic)
+        __REG_SET(HW_LRADC_CONVERSION) = HW_LRADC_CONVERSION__AUTOMATIC;
+    else
+        __REG_CLR(HW_LRADC_CONVERSION) = HW_LRADC_CONVERSION__AUTOMATIC;
 }
 
 int imx233_lradc_read_battery_voltage(void)
diff --git a/firmware/target/arm/imx233/lradc-imx233.h b/firmware/target/arm/imx233/lradc-imx233.h
index fb0085fc74..d79ebe0eff 100644
--- a/firmware/target/arm/imx233/lradc-imx233.h
+++ b/firmware/target/arm/imx233/lradc-imx233.h
@@ -130,7 +130,7 @@ void imx233_lradc_release_delay(int dchan);
  * channels must already be configured as nmos and pmos */
 int imx233_lradc_sense_die_temperature(int nmos_chan, int pmos_chan);
 
-void imx233_lradc_setup_battery_conversion(bool automatic, int scale_factor);
+void imx233_lradc_setup_battery_conversion(bool automatic, unsigned long scale_factor);
 // read scaled voltage, only available after proper setup
 int imx233_lradc_read_battery_voltage(void);