diff --git a/src/stm32/stm32f1.c b/src/stm32/stm32f1.c
index bb07d340..e5c18a83 100644
--- a/src/stm32/stm32f1.c
+++ b/src/stm32/stm32f1.c
@@ -165,6 +165,11 @@ armcm_main(void)
     SystemInit();
     SCB->VTOR = (uint32_t)VectorTable;
 
+    // Reset peripheral clocks (for some bootloaders that don't)
+    RCC->AHBENR = 0x14;
+    RCC->APB1ENR = 0;
+    RCC->APB2ENR = 0;
+
     // Setup clocks
     clock_setup();