diff --git a/Makefile b/Makefile
index 2049095..7b36645 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ preprocess:
 
 check: preprocess
 	stylua -c --indent-type Spaces ./
-	luacheck -d --globals tiny T Arr Maybe TextStyle --codes ./ --exclude-files ./test/ ./generated/
+	luacheck -d --globals tiny T Arr Maybe TextStyle --codes ./ --exclude-files ./test/ ./generated/ ./lib/
 
 test: check
 	find ./test -name '*.lua' | xargs -L1 -I %% lua %% -v