diff --git a/project/tree.mk b/project/tree.mk
index 4d698e4..c4485d5 100644
--- a/project/tree.mk
+++ b/project/tree.mk
@@ -1,4 +1,9 @@
 tree.tag:
 		mkdir -p src
+		mkdir -p src/adt
+		mkdir -p src/ast
 		mkdir -p src/driver
+		mkdir -p src/firm
+		mkdir -p src/parser
+		mkdir -p src/wrappergen
 		touch tree.tag