diff --git a/Makefrag b/Makefrag
index 86893223..b6acebae 100644
--- a/Makefrag
+++ b/Makefrag
@@ -16,6 +16,7 @@ FIRRTL ?= java -Xmx2G -Xss8M -XX:MaxPermSize=256M -cp $(FIRRTL_JAR) firrtl.Drive
 
 $(FIRRTL_JAR): $(shell find $(base_dir)/firrtl/src/main/scala -iname "*.scala")
 	$(MAKE) -C $(base_dir)/firrtl SBT="$(SBT)" root_dir=$(base_dir)/firrtl build-scala
+	touch $(FIRRTL_JAR)
 
 CHISEL_ARGS := --targetDir $(generated_dir)