diff --git a/Makefile b/Makefile
index 0ac5c1c..c021d5b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 .PHONY: build
-BUILD_FLAGS=--recursive --git-version --pytex-version --license --author "Maximilian Keßler" --pytex-info-text --extra-header ".build/header_info.txt" --name "prepend-author"
+BUILD_FLAGS=--recursive --git-version --pytex-version --license --author "Maximilian Keßler" --pytex-info-text --extra-header ".build/header_info.txt" --name "prepend-author" --clean-old-files
 BUILD_DIRS= --source-dir src --build-dir build
 
 build: .initsubmodulelock