diff --git a/packages/astro/src/core/build/generate.ts b/packages/astro/src/core/build/generate.ts
index 5897ba7e4dfc..7a67d292732a 100644
--- a/packages/astro/src/core/build/generate.ts
+++ b/packages/astro/src/core/build/generate.ts
@@ -371,7 +371,7 @@ function getUrlForPath(
 			break;
 		}
 		default: {
-			ending = '.html';
+			ending = '';
 			break;
 		}
 	}
diff --git a/packages/integrations/sitemap/src/index.ts b/packages/integrations/sitemap/src/index.ts
index 6b9124626443..057fc2371d62 100644
--- a/packages/integrations/sitemap/src/index.ts
+++ b/packages/integrations/sitemap/src/index.ts
@@ -132,18 +132,6 @@ const createPlugin = (options?: SitemapOptions): AstroIntegration => {
 
 					pageUrls = Array.from(new Set([...pageUrls, ...routeUrls, ...(customPages ?? [])]));
 
-					if(config.build.format === 'file') {
-						pageUrls = pageUrls.map((url) => {
-
-							if(url.endsWith('/')) {
-								return url;
-							}
-
-							return url + '.html';
-
-						});
-					}
-
 					try {
 						if (filter) {
 							pageUrls = pageUrls.filter(filter);