diff --git a/Makefile b/Makefile
index 4fb183e..d705807 100644
--- a/Makefile
+++ b/Makefile
@@ -2,13 +2,16 @@ all: patch/tree/map/definition.csv
 
 VANILLA_SRC ?= ../vanilla
 
-patch/tree:
+patch/tree patch/work:
 	mkdir $@
 patch/tree/map: patch/tree
 	mkdir $@
-patch/work/map_definition.csv: $(VANILLA_SRC)/map/definition.csv
+patch/work/map_definition.csv: $(VANILLA_SRC)/map/definition.csv | patch/work
 	cp -v $< $@
 patch/tree/map/definition.csv: patch/work/map_definition.csv patch/patches/map_definition.patch | patch/tree/map
-	cp -v $< $@
 	patch -u --binary -N $^
+	cp -v $< $@
 
+clean: 
+	rm -rf patch/tree patch/work
+.PHONY: all install clean