diff --git a/Source/STM32G071KBT6.cpp b/Source/STM32G071KBT6.cpp
index a8d7257..49530f1 100644
--- a/Source/STM32G071KBT6.cpp
+++ b/Source/STM32G071KBT6.cpp
@@ -56,7 +56,7 @@ extern "C" void CEC_IRQHandler(void);                    /* CEC
 extern std::uint32_t _estack;
 const uint32_t AHBPrescTable[16UL] = {0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL, 1UL, 2UL, 3UL, 4UL, 6UL, 7UL, 8UL, 9UL};
 const uint32_t APBPrescTable[8UL] =  {0UL, 0UL, 0UL, 0UL, 1UL, 2UL, 3UL, 4UL};
-std::uint32_t systick;
+volatile std::uint32_t systick;
 
 const std::uintptr_t interruptVectorTable[] __attribute__((section(".isr_vector")))
 {
@@ -164,7 +164,7 @@ extern "C" void UCPD1_2_IRQHandler(void){}                /* UCPD1, UCPD2
 extern "C" void DMA1_Channel2_3_IRQHandler(void){}        /* DMA1 Channel 2 and Channel 3 */
 extern "C" void DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler(void){} /* DMA1 Channel 4 to Channel 7, DMAMUX1 overrun */
 extern "C" void ADC1_COMP_IRQHandler(void){}              /* ADC1, COMP1 and COMP2         */
-extern "C" void TIM1_BRK_UP_TRG_COM_IRQHandler(void){}    /* TIM1 Break, Update, Trigger and Commutation */
+extern "C" void TIM1_BRK_UP_TRG_COM_IRQHandler(void){LL_GPIO_TogglePin(GPIOC, LL_GPIO_PIN_6);}    /* TIM1 Break, Update, Trigger and Commutation */
 extern "C" void TIM1_CC_IRQHandler(void){}                /* TIM1 Capture Compare         */
 extern "C" void TIM2_IRQHandler(void){}                   /* TIM2                         */
 extern "C" void TIM3_IRQHandler(void){}                   /* TIM3                         */
diff --git a/Source/STM32G071KBT6.hpp b/Source/STM32G071KBT6.hpp
index 3a1ef52..9ccb055 100644
--- a/Source/STM32G071KBT6.hpp
+++ b/Source/STM32G071KBT6.hpp
@@ -10,6 +10,6 @@
 
 #include <cstdint>
 
-extern std::uint32_t systick;
+extern volatile std::uint32_t systick;
 
 #endif /* STM32G071KBT6_HPP_ */