--- a/GNUmakefile	Mon Oct 01 23:46:10 2018 +0200
+++ b/GNUmakefile	Wed Oct 03 16:41:37 2018 +0200
@@ -73,7 +73,7 @@
 
 coverage:
 	-rm -- luacov.*
-	busted --lua=$(RUNWITH) -c
+	$(BUSTED) --lua=$(RUNWITH) -c
 	luacov
 	luacov-console
 	luacov-console -s