diff --git a/src/test/unit/telemetry_crsf_msp_unittest.cc b/src/test/unit/telemetry_crsf_msp_unittest.cc
index 2b8526c2d6..934bbfb081 100644
--- a/src/test/unit/telemetry_crsf_msp_unittest.cc
+++ b/src/test/unit/telemetry_crsf_msp_unittest.cc
@@ -260,6 +260,9 @@ extern "C" {
     uint16_t getBatteryVoltage(void) {
         return testBatteryVoltage;
     }
+    uint16_t getLegacyBatteryVoltage(void) {
+        return (testBatteryVoltage + 5) / 10;
+    }
     uint16_t getBatteryAverageCellVoltage(void) {
         return 0;
     }
diff --git a/src/test/unit/telemetry_crsf_unittest.cc b/src/test/unit/telemetry_crsf_unittest.cc
index a277c42c85..cbb6057113 100644
--- a/src/test/unit/telemetry_crsf_unittest.cc
+++ b/src/test/unit/telemetry_crsf_unittest.cc
@@ -323,6 +323,10 @@ uint16_t getBatteryVoltage(void) {
     return testBatteryVoltage;
 }
 
+uint16_t getLegacyBatteryVoltage(void) {
+    return (testBatteryVoltage + 5) / 10;
+}
+
 uint16_t getBatteryAverageCellVoltage(void) {
     return 0;
 }
diff --git a/src/test/unit/telemetry_hott_unittest.cc b/src/test/unit/telemetry_hott_unittest.cc
index ccab8072ef..f5bbef28fd 100644
--- a/src/test/unit/telemetry_hott_unittest.cc
+++ b/src/test/unit/telemetry_hott_unittest.cc
@@ -285,6 +285,11 @@ uint16_t getBatteryVoltage(void)
     return testBatteryVoltage;
 }
 
+uint16_t getLegacyBatteryVoltage(void)
+{
+    return (testBatteryVoltage + 5) / 10;
+}
+
 int32_t getAmperage(void) {
     return testAmperage;
 }