diff --git a/firmware/common/timefuncs.c b/firmware/common/timefuncs.c
index 19033a504e..6671dc0739 100644
--- a/firmware/common/timefuncs.c
+++ b/firmware/common/timefuncs.c
@@ -43,12 +43,11 @@ bool valid_time(const struct tm *tm)
         return true;
 }
 
-static int last_tick = 0;
-
 struct tm *get_time(void)
 {
 #ifndef SIMULATOR
 #ifdef CONFIG_RTC
+    static long last_tick = 0;
 
     /* Don't read the RTC more than 4 times per second */
     if (last_tick + HZ/4 < current_tick) {
diff --git a/firmware/drivers/adc.c b/firmware/drivers/adc.c
index 1755fafb99..f4bdb7a54f 100644
--- a/firmware/drivers/adc.c
+++ b/firmware/drivers/adc.c
@@ -321,7 +321,7 @@ void adc_init(void)
 {
     struct adc_struct *adc_battery = &adcdata[ADC_BATTERY];
     adc_battery->channelnum = 0x3; /* ADCVIN1, subtractor */
-
+    adc_battery->last_read = current_tick;
     adc_scan(adc_battery);
 }