diff --git a/Makefile b/Makefile
index 916e8a2a68..a516266811 100644
--- a/Makefile
+++ b/Makefile
@@ -299,7 +299,7 @@ decks/update:
 ref/MagicCompRules_latest.txt:
 	wget `curl http://magic.wizards.com/en/gameinfo/gameplay/formats/comprehensiverules | grep -o "http://media.*\.txt"` -O $@
 
-ref/rules.txt: $(lastword $(wildcard ref/MagicCompRules_*.txt))
+ref/rules.txt: ref/MagicCompRules_latest.txt
 	fmt -s $^ > $@
 	flip -bu $@