diff --git a/Makefile b/Makefile
index f3a74f57..c083ddf8 100644
--- a/Makefile
+++ b/Makefile
@@ -32,7 +32,8 @@ public/packs/manifest.json.br: $(assets)
 
 assets: public/packs/manifest.json.br
 
-test/%_test.rb: always
+tests := $(shell find test/ -name "*_test.rb")
+$(tests): always
 	$(hain) 'cd /Sutty/sutty; bundle exec rake test TEST="$@" RAILS_ENV=test'
 
 test: always