diff --git a/Makefile b/Makefile
index 10cdcf43f..a4043ea69 100644
--- a/Makefile
+++ b/Makefile
@@ -136,7 +136,7 @@ well-known/.well-known:
 
 .PHONY: clean
 clean:
-	rm -rf node_modules .npm assets/icons well-known
+	rm -rf node_modules .npm assets/icons well-known .well-known-cache
 	rm -rf .stack-work .stack-work-build .stack-work-run .stack-work-test .stack-work-doc
 	rm -rf bin/