diff --git a/Makefile b/Makefile
index baaa8c1..9319431 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,10 @@ image: .jsimage
 src/node_modules:
 	mkdir -p $@
 
-src/yarn.lock: src/node_modules src/package.json
+public:
+	mkdir -p $@
+
+src/yarn.lock: public src/node_modules src/package.json
 	$(YARN)
 	@touch -mr $(shell ls -Atd $? | head -1) $@