diff --git a/lib/preprocessor.js b/lib/preprocessor.js
index e4fa517..d8dcceb 100644
--- a/lib/preprocessor.js
+++ b/lib/preprocessor.js
@@ -112,6 +112,7 @@ class Preprocessor {
     return { Type: types.tuple, defs: { value: source } };
   }
 
+  // eslint-disable-next-line class-methods-use-this
   functionField() {
     return {};
   }