diff --git a/firmware/config/boards/microrusefi/board_configuration.cpp b/firmware/config/boards/microrusefi/board_configuration.cpp
index 9e7f6e7f90..02d51d1149 100644
--- a/firmware/config/boards/microrusefi/board_configuration.cpp
+++ b/firmware/config/boards/microrusefi/board_configuration.cpp
@@ -66,8 +66,9 @@ static void setupVbatt() {
 */
 
 	// 6.8k high side/10k low side = 1.6667 ratio divider
-	engineConfiguration->analogInputDividerCoefficient = 16.8f / 10f;
+	engineConfiguration->analogInputDividerCoefficient = 16.8f / 10.0f;
 
+	// set vbatt_divider 8.16
 	// R139=39k high side/R141=10k low side multiplied by above analogInputDividerCoefficient = 8.166666f
 	engineConfiguration->vbattDividerCoeff = (49.0f / 10.0f) * engineConfiguration->analogInputDividerCoefficient;
 	engineConfiguration->vbattAdcChannel = EFI_ADC_11;