diff --git a/board/boards/cuatro.h b/board/boards/cuatro.h
index 90d0627517..5d4bdad43f 100644
--- a/board/boards/cuatro.h
+++ b/board/boards/cuatro.h
@@ -71,10 +71,6 @@ static void cuatro_set_bootkick(BootState state) {
   //set_gpio_output(GPIOC, 12, state != BOOT_RESET);
 }
 
-static void cuatro_set_siren(bool enabled){
-  beeper_enable(enabled);
-}
-
 static void cuatro_set_amp_enabled(bool enabled){
   set_gpio_output(GPIOA, 5, enabled);
 }
@@ -133,10 +129,6 @@ static void cuatro_init(void) {
   // Clock source
   clock_source_init();
 
-  // Beeper
-  set_gpio_alternate(GPIOD, 14, GPIO_AF2_TIM4);
-  beeper_init();
-
   // Sound codec
   cuatro_set_amp_enabled(false);
   set_gpio_alternate(GPIOA, 2, GPIO_AF8_SAI4);    // SAI4_SCK_B
@@ -170,7 +162,7 @@ board board_cuatro = {
   .read_current_mA = cuatro_read_current_mA,
   .set_fan_enabled = cuatro_set_fan_enabled,
   .set_ir_power = unused_set_ir_power,
-  .set_siren = cuatro_set_siren,
+  .set_siren = unused_set_siren,
   .set_bootkick = cuatro_set_bootkick,
   .read_som_gpio = tres_read_som_gpio,
   .set_amp_enabled = cuatro_set_amp_enabled
diff --git a/board/drivers/beeper.h b/board/drivers/beeper.h
deleted file mode 100644
index 0ae02ff5e6..0000000000
--- a/board/drivers/beeper.h
+++ /dev/null
@@ -1,26 +0,0 @@
-
-#define BEEPER_COUNTER_OVERFLOW 25000U // 4kHz
-
-void beeper_enable(bool enabled) {
-  if (enabled) {
-    register_set_bits(&(TIM4->CCER), TIM_CCER_CC3E);
-  } else {
-    register_clear_bits(&(TIM4->CCER), TIM_CCER_CC3E);
-  }
-}
-
-void beeper_init(void) {
-  // Enable timer and auto-reload
-  register_set(&(TIM4->CR1), TIM_CR1_CEN | TIM_CR1_ARPE, 0x3FU);
-
-  // Set channel as PWM mode 1 and disable output
-  register_set_bits(&(TIM4->CCMR2), (TIM_CCMR2_OC3M_2 | TIM_CCMR2_OC3M_1 | TIM_CCMR2_OC3PE));
-  beeper_enable(false);
-
-  // Set max counter value and compare to get 50% duty
-  register_set(&(TIM4->CCR3), BEEPER_COUNTER_OVERFLOW / 2U, 0xFFFFU);
-  register_set(&(TIM4->ARR), BEEPER_COUNTER_OVERFLOW, 0xFFFFU);
-
-  // Update registers and clear counter
-  TIM4->EGR |= TIM_EGR_UG;
-}
diff --git a/board/stm32h7/board.h b/board/stm32h7/board.h
index ea4812245e..6ab75f55d8 100644
--- a/board/stm32h7/board.h
+++ b/board/stm32h7/board.h
@@ -10,7 +10,6 @@
 #include "drivers/fan.h"
 #include "stm32h7/llfan.h"
 #include "stm32h7/lldac.h"
-#include "drivers/beeper.h"
 #include "drivers/fake_siren.h"
 #include "stm32h7/sound.h"
 #include "drivers/clock_source.h"
diff --git a/board/stm32h7/peripherals.h b/board/stm32h7/peripherals.h
index c6874b8ac3..db89a38ad3 100644
--- a/board/stm32h7/peripherals.h
+++ b/board/stm32h7/peripherals.h
@@ -130,7 +130,6 @@ void peripherals_init(void) {
   RCC->APB2ENR |= RCC_APB2ENR_TIM1EN;  // clock source timer
   RCC->APB1LENR |= RCC_APB1LENR_TIM2EN;  // main counter
   RCC->APB1LENR |= RCC_APB1LENR_TIM3EN;  // fan pwm
-  RCC->APB1LENR |= RCC_APB1LENR_TIM4EN;  // beeper source
   RCC->APB1LENR |= RCC_APB1LENR_TIM6EN;  // interrupt timer
   RCC->APB1LENR |= RCC_APB1LENR_TIM7EN;  // DMA trigger timer
   RCC->APB2ENR |= RCC_APB2ENR_TIM8EN;  // tick timer
diff --git a/tests/misra/test_misra.sh b/tests/misra/test_misra.sh
index c35ed02a13..64a6bf27a8 100755
--- a/tests/misra/test_misra.sh
+++ b/tests/misra/test_misra.sh
@@ -50,7 +50,7 @@ cppcheck() {
           --suppressions-list=$DIR/suppressions.txt --suppress=*:*inc/* \
           --suppress=*:*include/* --error-exitcode=2 --check-level=exhaustive --safety \
           --platform=arm32-wchar_t4 $COMMON_DEFINES --checkers-report=$CHECKLIST.tmp \
-          --std=c11 "$@" |& tee $OUTPUT
+          --std=c11 "$@" 2>&1 | tee $OUTPUT
 
   cat $CHECKLIST.tmp >> $CHECKLIST
   rm $CHECKLIST.tmp