diff --git a/tests/app-template/app/index.html b/tests/app-template/app/index.html
index c53dfc7da6..b1d1850aaf 100644
--- a/tests/app-template/app/index.html
+++ b/tests/app-template/app/index.html
@@ -16,7 +16,7 @@
   <body>
     {{content-for "body"}}
 
-    <script src="/@embroider/core/vendor.js"></script>
+    <script src="%BASE_URL%/@embroider/core/vendor.js"></script>
     <script type="module">
       import Application from './app';
       import environment from './config/environment';
diff --git a/tests/app-template/tests/index.html b/tests/app-template/tests/index.html
index c68003bd76..662dec0e8d 100644
--- a/tests/app-template/tests/index.html
+++ b/tests/app-template/tests/index.html
@@ -25,8 +25,8 @@
     </div>
 
     <script src="/testem.js" integrity="" data-embroider-ignore></script>
-    <script src="/@embroider/core/vendor.js"></script>
-    <script src="/@embroider/core/test-support.js"></script>
+    <script src="%BASE_URL%/@embroider/core/vendor.js"></script>
+    <script src="%BASE_URL%/@embroider/core/test-support.js"></script>
     <script src="/@embroider/core/test-entrypoint" type="module"></script>
 
     {{content-for "body-footer"}} {{content-for "test-body-footer"}}
diff --git a/tests/ts-app-template/app/index.html b/tests/ts-app-template/app/index.html
index 8fcb46225b..eb54b64923 100644
--- a/tests/ts-app-template/app/index.html
+++ b/tests/ts-app-template/app/index.html
@@ -16,7 +16,7 @@
   <body>
     {{content-for "body"}}
 
-    <script src="/@embroider/core/vendor.js"></script>
+    <script src="%BASE_URL%/@embroider/core/vendor.js"></script>
     <script type="module">
       import Application from './app';
       import environment from './config/environment';
