diff --git a/lib/blocks/script.js b/lib/blocks/script.js
index f45d3eda..d5fda8c9 100644
--- a/lib/blocks/script.js
+++ b/lib/blocks/script.js
@@ -12,6 +12,8 @@ export function createScriptBlock(pathPrefix, source) {
     const { manifest } = source;
     const { basePath, modern, css, preloads, legacy } = manifest;
 
+    const pathSrc = basePath && basePath !== 'http://localhost:3000' ? basePath : '';
+
     const modernEntry = modern[entry];
     const cssEntry = css[entry];
 
@@ -26,11 +28,11 @@ export function createScriptBlock(pathPrefix, source) {
     if (shouldPreload) {
       preloads.forEach((preload) => {
         const preloadPath = [pathPrefix, preload].join('/');
-        const preloadUrl = new URL(preloadPath, basePath);
+        const preloadUrl = new URL(preloadPath, pathSrc);
         const resolvedPreload = resolve(pathPrefix, preload);
         output.push(
           `<link rel="preload" href="${
-            basePath ? preloadUrl : resolvedPreload
+            pathSrc ? preloadUrl : resolvedPreload
           }" as="script" crossorigin>`
         );
       });
@@ -38,32 +40,32 @@ export function createScriptBlock(pathPrefix, source) {
 
     if (cssEntry) {
       const cssEntryPath = [pathPrefix, cssEntry].join('/');
-      const cssEntryUrl = new URL(cssEntryPath, basePath);
+      const cssEntryUrl = new URL(cssEntryPath, pathSrc);
       const resolvedCssEntry = resolve(pathPrefix, cssEntry);
       output.push(
         `<link rel="stylesheet" href="${
-          basePath ? cssEntryUrl : resolvedCssEntry
+          pathSrc ? cssEntryUrl : resolvedCssEntry
         }">`
       );
     }
 
     const modernEntryPath = [pathPrefix, modernEntry].join('/');
-    const modernEntryUrl = new URL(modernEntryPath, basePath);
+    const modernEntryUrl = new URL(modernEntryPath, pathSrc);
     const resolvedModernEntry = resolve(pathPrefix, modernEntry);
     output.push(
       `<script type="module" src="${
-        basePath ? modernEntryUrl : resolvedModernEntry
+        pathSrc ? modernEntryUrl : resolvedModernEntry
       }"></script>`
     );
 
     if ('legacy' in manifest) {
       const legacyEntry = legacy[entry];
       const legacyEntryPath = [pathPrefix, legacyEntry].join('/');
-      const legacyEntryUrl = new URL(legacyEntryPath, basePath);
+      const legacyEntryUrl = new URL(legacyEntryPath, pathSrc);
       const resolvedLegacyEntry = resolve(pathPrefix, legacyEntry);
       output.push(
         `<script nomodule defer src="${
-          basePath ? legacyEntryUrl : resolvedLegacyEntry
+          pathSrc ? legacyEntryUrl : resolvedLegacyEntry
         }"></script>`
       );
     }