diff --git a/tsconfig.eng.json b/tsconfig.eng.json
index da1dc81e44..b23fb63e17 100644
--- a/tsconfig.eng.json
+++ b/tsconfig.eng.json
@@ -1,7 +1,8 @@
 {
   "extends": "./core/tsconfig.base.json",
   "compilerOptions": {
-    "allowJs": true
+    "allowJs": true,
+    "allowImportingTsExtensions": true
   },
   "include": ["./eng", "./core/eng"],
   "exclude": ["./core/eng/vitest.config.ts", "./eng/scripts/doc-updater"]