diff --git a/radio/src/targets/simu/simpgmspace.cpp b/radio/src/targets/simu/simpgmspace.cpp
index e907eabf3..101294b18 100644
--- a/radio/src/targets/simu/simpgmspace.cpp
+++ b/radio/src/targets/simu/simpgmspace.cpp
@@ -61,6 +61,7 @@ RCC_TypeDef rcc;
 DMA_Stream_TypeDef dma1_stream2, dma1_stream5, dma1_stream7, dma2_stream1, dma2_stream2, dma2_stream5, dma2_stream6;
 DMA_TypeDef dma2;
 USART_TypeDef Usart0, Usart1, Usart2, Usart3, Usart4;
+SysTick_Type systick;
 #elif defined(CPUARM)
 Pio Pioa, Piob, Pioc;
 Pmc pmc;
diff --git a/radio/src/targets/simu/simpgmspace.h b/radio/src/targets/simu/simpgmspace.h
index b5350132e..0a854b60c 100644
--- a/radio/src/targets/simu/simpgmspace.h
+++ b/radio/src/targets/simu/simpgmspace.h
@@ -93,6 +93,9 @@ extern USART_TypeDef Usart0, Usart1, Usart2, Usart3, Usart4;
 extern RCC_TypeDef rcc;
 extern DMA_Stream_TypeDef dma1_stream2, dma1_stream5, dma1_stream7, dma2_stream1, dma2_stream2, dma2_stream5, dma2_stream6;
 extern DMA_TypeDef dma2;
+extern SysTick_Type systick;
+#undef SysTick
+#define SysTick (&systick)
 #undef GPIOA
 #undef GPIOB
 #undef GPIOC