diff --git a/packages/@aws-cdk/cfnspec/build-tools/create-missing-libraries.ts b/packages/@aws-cdk/cfnspec/build-tools/create-missing-libraries.ts
index 35360473b8a4e..8a62868591119 100644
--- a/packages/@aws-cdk/cfnspec/build-tools/create-missing-libraries.ts
+++ b/packages/@aws-cdk/cfnspec/build-tools/create-missing-libraries.ts
@@ -254,6 +254,7 @@ async function main() {
       '**/cdk.out',
       'junit.xml',
       'test/',
+      '!*.lit.ts',
     ]);
 
     await write('lib/index.ts', [