diff --git a/Core/Src/Clock_Sync.c b/Core/Src/Clock_Sync.c
index 54d94c0..78f4067 100644
--- a/Core/Src/Clock_Sync.c
+++ b/Core/Src/Clock_Sync.c
@@ -10,6 +10,8 @@ static FDCAN_HandleTypeDef* can;
 static TIM_HandleTypeDef* sync_timer;
 static TIM_HandleTypeDef* heartbeat_timer;
 
+static uint8_t clock_sync_counter = 0;
+
 void clock_sync_init(FDCAN_HandleTypeDef* can_handle,
                      TIM_HandleTypeDef* sync_timer_handle,
                      TIM_HandleTypeDef* heartbeat_timer_handle) {
@@ -25,7 +27,8 @@ void clock_sync_init(FDCAN_HandleTypeDef* can_handle,
 
 void clock_sync_handle_timer_complete(TIM_HandleTypeDef* timer) {
   if (timer == sync_timer) {
-    CAN_Transmit(can, CLOCK_SYNC_ADDRESS, NULL, 0);
+    CAN_Transmit(can, CLOCK_SYNC_ADDRESS, &clock_sync_counter, 1);
+    clock_sync_counter++;
   } else if (timer == heartbeat_timer) {
     CAN_Transmit(can, MASTER_HEARTBEAT_ADDRESS, NULL, 0);
   }