diff --git a/firmware/ice40-riscv/icE1usb/Makefile b/firmware/ice40-riscv/icE1usb/Makefile
index b05a532..3fde2ca 100644
--- a/firmware/ice40-riscv/icE1usb/Makefile
+++ b/firmware/ice40-riscv/icE1usb/Makefile
@@ -101,7 +101,7 @@
 	$(ICEPROG) -o 640k $<
 
 dfuprog: $(GITVER).bin
-	$(DFU_UTIL) -R -a 1 -D $<
+	$(DFU_UTIL) -R -d 1d50:6145,1d50:6144 -a 1 -D $<
 
 
 clean: