diff --git a/.changeset/rude-lies-share.md b/.changeset/rude-lies-share.md
new file mode 100644
index 000000000..41e40b9dc
--- /dev/null
+++ b/.changeset/rude-lies-share.md
@@ -0,0 +1,6 @@
+---
+"@web/dev-server-storybook": patch
+"@web/dev-server": patch
+---
+
+fix: sb windows path
diff --git a/packages/dev-server-storybook/src/shared/config/readStorybookConfig.ts b/packages/dev-server-storybook/src/shared/config/readStorybookConfig.ts
index 8187be293..ed1d3081d 100644
--- a/packages/dev-server-storybook/src/shared/config/readStorybookConfig.ts
+++ b/packages/dev-server-storybook/src/shared/config/readStorybookConfig.ts
@@ -70,7 +70,7 @@ export async function readStorybookConfig(
   }
 
   const mainJs = commonJsMainExists
-    ? validateMainJs((await import(commonJsMainPath)).default)
+    ? validateMainJs((await import(pathToFileURL(commonJsMainPath).href)).default)
     : validateMainJs((await import(pathToFileURL(mainJsPath).href)).default);
 
   return {