diff --git a/ember-resources/rollup.config.js b/ember-resources/rollup.config.js
index 945e2b88a..3724ff8f8 100644
--- a/ember-resources/rollup.config.js
+++ b/ember-resources/rollup.config.js
@@ -33,7 +33,12 @@ export default defineConfig({
       browserslist: ['last 2 firefox versions', 'last 2 chrome versions'],
       tsconfig: {
         fileName: 'tsconfig.json',
-        hook: (config) => ({ ...config, declaration: true, declarationDir: 'dist' }),
+        hook: (config) => ({
+          ...config,
+          declaration: true,
+          declarationDir: 'dist',
+          declarationMap: true,
+        }),
       },
     }),
 
diff --git a/testing/build/expected-output-files.txt b/testing/build/expected-output-files.txt
index bca3c4fb8..32e506e3d 100644
--- a/testing/build/expected-output-files.txt
+++ b/testing/build/expected-output-files.txt
@@ -1,3 +1,4 @@
-index.js
 index.d.ts
+index.d.ts.map
+index.js
 index.js.map