diff --git a/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/inc/stm32f10x_exti.h b/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/inc/stm32f10x_exti.h
index 29bed11cf..99084e3f3 100644
--- a/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/inc/stm32f10x_exti.h
+++ b/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/inc/stm32f10x_exti.h
@@ -155,7 +155,7 @@ typedef struct
   */
 
 void EXTI_DeInit(void);
-void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);
+void EXTI_Init(const EXTI_InitTypeDef* EXTI_InitStruct);
 void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct);
 void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line);
 FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line);
diff --git a/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_exti.c b/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_exti.c
index f9467d0dc..73de195cb 100755
--- a/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_exti.c
+++ b/flight/PiOS/STM32F10x/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_exti.c
@@ -97,7 +97,7 @@ void EXTI_DeInit(void)
   *   that contains the configuration information for the EXTI peripheral.
   * @retval None
   */
-void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
+void EXTI_Init(const EXTI_InitTypeDef* EXTI_InitStruct)
 {
   uint32_t tmp = 0;