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-rw-r--r--src/battery/battery.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/battery/battery.cpp b/src/battery/battery.cpp
index b3567ee5..95f2d17b 100644
--- a/src/battery/battery.cpp
+++ b/src/battery/battery.cpp
@@ -35,7 +35,7 @@ static const uint32_t kEmptyChargeMilliVolts = 3200; // BMS limit is 3100.
using ChargeStatus = drivers::Samd::ChargeStatus;
-void check_voltage_cb(TimerHandle_t timer) {
+static void check_voltage_cb(TimerHandle_t timer) {
Battery* instance = reinterpret_cast<Battery*>(pvTimerGetTimerID(timer));
instance->Update();
}