diff --git a/Makefile b/Makefile
index 2b0bf581c..4f11215ee 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ customize: venv
 	. venv/bin/activate; python3 scripts/customize.py
 
 build.stamp: venv sources/config.yaml $(SOURCES)
-	rm -rf fonts
+	rm -rf fonts fonts-underline fonts-alternates
 	(for config in sources/config*.yaml; do . venv/bin/activate; gftools builder $$config; done) && touch build.stamp
 	. venv/bin/activate; python3 sources/vtt/hinting.py; bash alternates.sh