diff --git a/board/main.c b/board/main.c
index b8bcb1debc1d98..3d41ec65679237 100644
--- a/board/main.c
+++ b/board/main.c
@@ -69,6 +69,7 @@ bool is_gpio_started(void) {
   return (GPIOA->IDR & (1U << 1)) == 0;
 }
 
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void EXTI1_IRQHandler(void) {
   volatile unsigned int pr = EXTI->PR & (1U << 1);
   if ((pr & (1U << 1)) != 0U) {
@@ -524,6 +525,7 @@ int spi_cb_rx(uint8_t *data, int len, uint8_t *data_out) {
 
 // ***************************** main code *****************************
 
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void __initialize_hardware_early(void) {
   early();
 }
@@ -537,6 +539,7 @@ uint64_t tcnt = 0;
 uint64_t marker = 0;
 
 // called once per second
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void TIM3_IRQHandler(void) {
   #define CURRENT_THRESHOLD 0xF00U
   #define CLICKS 5U // 5 seconds to switch modes
diff --git a/board/pedal/main.c b/board/pedal/main.c
index 744058ecdf0733..522acfd1db42fb 100644
--- a/board/pedal/main.c
+++ b/board/pedal/main.c
@@ -30,6 +30,7 @@
 #define ENTER_BOOTLOADER_MAGIC 0xdeadbeef
 uint32_t enter_bootloader_mode;
 
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void __initialize_hardware_early(void) {
   early();
 }
@@ -122,6 +123,7 @@ uint8_t pedal_checksum(uint8_t *dat, int len) {
 #define CAN_GAS_SIZE 6
 #define COUNTER_CYCLE 0xFU
 
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void CAN1_TX_IRQHandler(void) {
   // clear interrupt
   CAN->TSR |= CAN_TSR_RQCP0;
@@ -144,6 +146,7 @@ uint32_t current_index = 0;
 #define FAULT_INVALID 6U
 uint8_t state = FAULT_STARTUP;
 
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void CAN1_RX0_IRQHandler(void) {
   while ((CAN->RF0R & CAN_RF0R_FMP0) != 0) {
     #ifdef DEBUG
@@ -210,6 +213,7 @@ void CAN1_RX0_IRQHandler(void) {
   }
 }
 
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void CAN1_SCE_IRQHandler(void) {
   state = FAULT_SCE;
   llcan_clear_send(CAN);
@@ -221,6 +225,7 @@ unsigned int pkt_idx = 0;
 
 int led_value = 0;
 
+// cppcheck-suppress unusedFunction ; used in headers not included in cppcheck
 void TIM3_IRQHandler(void) {
   #ifdef DEBUG
     puth(TIM3->CNT);