diff --git a/targets/stm32l432/bootloader/main.c b/targets/stm32l432/bootloader/main.c
index ef057ed..a6103c3 100644
--- a/targets/stm32l432/bootloader/main.c
+++ b/targets/stm32l432/bootloader/main.c
@@ -26,6 +26,7 @@
 
 uint8_t REBOOT_FLAG = 0;
 
+void SystemClock_Config(void);
 
 void BOOT_boot(void)
 {