diff --git a/_tags b/_tags
index 1f1927d..4cea097 100644
--- a/_tags
+++ b/_tags
@@ -1 +1 @@
-true: package(unix)
+true: package(unix), warn(-40)
diff --git a/src/oboy.ml b/src/oboy.ml
index 70165a8..31a3e38 100644
--- a/src/oboy.ml
+++ b/src/oboy.ml
@@ -1,4 +1,3 @@
-open Cartridge
 open Printf
 
 (** Power up sequence