diff --git a/Makefrag b/Makefrag
index 594ca080..4a6be9fa 100644
--- a/Makefrag
+++ b/Makefrag
@@ -13,8 +13,9 @@ FIRRTL ?= java -Xmx2G -Xss8M -XX:MaxPermSize=256M -cp $(ROCKET_CLASSES):$(FIRRTL
 
 $(FIRRTL_JAR): $(call lookup_scala_srcs, $(ROCKETCHIP_DIR)/firrtl/src/main/scala)
 	$(MAKE) -C $(ROCKETCHIP_DIR)/firrtl SBT="$(SBT)" root_dir=$(ROCKETCHIP_DIR)/firrtl build-scala
-	mkdir -p $(ROCKETCHIP_DIR)/lib
-	cp -p $(ROCKETCHIP_DIR)/firrtl/utils/bin/firrtl.jar $(FIRRTL_JAR)
+	mkdir -p $(dir $@)
+	cp -p $(ROCKETCHIP_DIR)/firrtl/utils/bin/firrtl.jar $@
+	touch $@
 
 build_dir=$(sim_dir)/generated-src
 testchip_dir = $(base_dir)/testchipip