diff --git a/src/core/sync/create_manifest_data/index.js b/src/core/sync/create_manifest_data/index.js
index 6e97903682f448a9c95a01527530bd0bdb545174..d233d9c10da549f31bb4d4ff48204bb9f9b4a9e9 100644
--- a/src/core/sync/create_manifest_data/index.js
+++ b/src/core/sync/create_manifest_data/index.js
@@ -222,7 +222,9 @@ function create_routes_and_nodes(cwd, config, fallback) {
 
 			// We can't use withFileTypes because of a NodeJs bug which returns wrong results
 			// with isDirectory() in case of symlinks: https://github.com/nodejs/node/issues/30646
-			const files = fs.readdirSync(dir).map((name) => ({
+			// Sorted so route nodes get the same numbers under every runtime: Node
+			// returns directory entries sorted, Bun returns them in on-disk order.
+			const files = fs.readdirSync(dir).sort().map((name) => ({
 				is_dir: fs.statSync(path.join(dir, name)).isDirectory(),
 				name
 			}));