diff --git a/aoc.asd b/aoc.asd
index 477fada..c55f78b 100644
--- a/aoc.asd
+++ b/aoc.asd
@@ -31,7 +31,7 @@
 
 (defsystem "aoc/tests"
   :author "Peter Tillemans"
-  :license "MIT"
+  :license "GPL"
   :depends-on ("aoc"
 	       #:parachute)
   :components ((:module "tests"