diff --git a/lib/config/defaults.js b/lib/config/defaults.js
index c1795b99..dc95d346 100644
--- a/lib/config/defaults.js
+++ b/lib/config/defaults.js
@@ -25,7 +25,9 @@ const defaults = {
   watchOptions: {},
 };
 
-if ((process.env.NODE_OPTIONS || '').includes('--loader')) {
+const nodeOptions = process.env.NODE_OPTIONS || ''; // ?
+
+if (/--(loader|import)\b/.test(nodeOptions)) {
   delete defaults.execMap.ts;
 }