diff --git a/packages/babel-plugin-transform-classes/src/index.js b/packages/babel-plugin-transform-classes/src/index.js
index 5fbd90f82a32..07b48406dfab 100644
--- a/packages/babel-plugin-transform-classes/src/index.js
+++ b/packages/babel-plugin-transform-classes/src/index.js
@@ -21,7 +21,7 @@ export default declare((api, options) => {
 
   const { loose } = options;
 
-  const setClassMethods = options.loose || api.assumption("setClassMethods");
+  const setClassMethods = options.loose ?? api.assumption("setClassMethods");
 
   // todo: investigate traversal requeueing
   const VISITED = Symbol();