diff --git a/ports/stm32/Makefile b/ports/stm32/Makefile
index 418562f7cb..19643cac56 100644
--- a/ports/stm32/Makefile
+++ b/ports/stm32/Makefile
@@ -546,7 +546,7 @@ define RUN_DFU
 	$(ECHO) "Writing $(1) to the board"
 	$(if $(filter $(USE_PYDFU),1),\
 	$(Q)$(PYTHON) $(PYDFU) --vid $(BOOTLOADER_DFU_USB_VID) --pid $(BOOTLOADER_DFU_USB_PID) -u $(1),
-	$(Q)$(DFU_UTIL) -a 0 -d $(BOOTLOADER_DFU_USB_VID):$(BOOTLOADER_DFU_USB_PID) -D $(1))
+	$(Q)$(DFU_UTIL) -a 0 -d $(BOOTLOADER_DFU_USB_VID):$(BOOTLOADER_DFU_USB_PID) -D $(1) -s :leave)
 endef
 
 define RUN_STLINK