1 files changed, 7 insertions, 3 deletions
diff --git a/packages/astro-rss/src/util.ts b/packages/astro-rss/src/util.ts
index 0dad6b239..7218cc934 100644
--- a/packages/astro-rss/src/util.ts
+++ b/packages/astro-rss/src/util.ts
@@ -1,10 +1,8 @@
-import npath from 'path-browserify';
-
 /** Normalize URL to its canonical form */
 export function createCanonicalURL(url: string, base?: string): URL {
 	let pathname = url.replace(/\/index.html$/, ''); // index.html is not canonical
 	pathname = pathname.replace(/\/1\/?$/, ''); // neither is a trailing /1/ (impl. detail of collections)
-	if (!npath.extname(pathname)) pathname = pathname.replace(/(\/+)?$/, '/'); // add trailing slash if there’s no extension
+	if (!getUrlExtension(url)) pathname = pathname.replace(/(\/+)?$/, '/'); // add trailing slash if there’s no extension
 	pathname = pathname.replace(/\/+/g, '/'); // remove duplicate slashes (URL() won’t)
 	return new URL(pathname, base);
 }
@@ -17,3 +15,9 @@ export function isValidURL(url: string): boolean {
 	} catch (e) {}
 	return false;
 }
+
+function getUrlExtension(url: string) {
+	const lastDot = url.lastIndexOf('.');
+	const lastSlash = url.lastIndexOf('/');
+	return lastDot > lastSlash ? url.slice(lastDot + 1) : '';
+}