diff --git a/Makefile b/Makefile
index 282134f..5d1e246 100644
--- a/Makefile
+++ b/Makefile
@@ -58,7 +58,7 @@ veryclean: clean thirdpartyclean
 	rm -f web/bootstrap/css/bootstrap.css
 
 $(APP).native: $(wildcard *.ml)
-	ocamlbuild -use-ocamlfind -X thirdparty $@
+	ocamlbuild -use-ocamlfind -X thirdparty -X scratch $@
 
 run: all
 	./$(APP).native