diff --git a/packages/integrations/markdoc/src/index.ts b/packages/integrations/markdoc/src/index.ts
index 2fc4021df..8e70187de 100644
--- a/packages/integrations/markdoc/src/index.ts
+++ b/packages/integrations/markdoc/src/index.ts
@@ -1,8 +1,8 @@
 import type { AstroIntegration, AstroConfig } from 'astro';
-import { InlineConfig, normalizePath } from 'vite';
+import { InlineConfig } from 'vite';
 import type { Config } from '@markdoc/markdoc';
 import Markdoc from '@markdoc/markdoc';
-import { getAstroConfigPath, MarkdocError, parseFrontmatter } from './utils.js';
+import { prependForwardSlash, getAstroConfigPath, MarkdocError, parseFrontmatter } from './utils.js';
 import { fileURLToPath } from 'node:url';
 import fs from 'node:fs';
 
@@ -39,7 +39,7 @@ export default function markdoc(markdocConfig: Config = {}): AstroIntegration {
 
 								validateRenderProperties(markdocConfig, config);
 								const body =
-									getEntryInfo({ fileUrl: new URL('/' + normalizePath(id), 'file://'), contents: code }).body;
+									getEntryInfo({ fileUrl: new URL(prependForwardSlash(id), 'file://'), contents: code }).body;
 								const ast = Markdoc.parse(body);
 								const content = Markdoc.transform(ast, markdocConfig);
 
diff --git a/packages/integrations/markdoc/src/utils.ts b/packages/integrations/markdoc/src/utils.ts
index 9ef80e1bf..33746f53b 100644
--- a/packages/integrations/markdoc/src/utils.ts
+++ b/packages/integrations/markdoc/src/utils.ts
@@ -102,3 +102,10 @@ export function getAstroConfigPath(fs: typeof fsMod, root: string): string | und
 		}
 	}
 }
+
+/**
+ * @see 'astro/src/core/path.ts'
+ */
+export function prependForwardSlash(path: string) {
+	return path[0] === '/' ? path : '/' + path;
+}