diff --git a/firmware/ice40-riscv/e1-tracer/Makefile b/firmware/ice40-riscv/e1-tracer/Makefile
index 8161066..030501e 100644
--- a/firmware/ice40-riscv/e1-tracer/Makefile
+++ b/firmware/ice40-riscv/e1-tracer/Makefile
@@ -84,7 +84,7 @@ prog: $(GITVER).bin
 	$(ICEPROG) -o 640k $<
 
 dfuprog: $(GITVER).bin
-	$(DFU_UTIL) -R -a 1 -D $<
+	$(DFU_UTIL) -R -d 1d50:6151,1d50:6150 -a 1 -D $<
 
 
 clean: