diff --git a/scripts/bundle-a2ui.mjs b/scripts/bundle-a2ui.mjs
index 085ea322075..3cf462e4c3b 100644
--- a/scripts/bundle-a2ui.mjs
+++ b/scripts/bundle-a2ui.mjs
@@ -67,6 +67,18 @@ export function getLocalRolldownCliCandidates(repoRoot = rootDir) {
   ];
 }
 
+export function compareNormalizedPaths(left, right) {
+  const normalizedLeft = normalizePath(left);
+  const normalizedRight = normalizePath(right);
+  if (normalizedLeft < normalizedRight) {
+    return -1;
+  }
+  if (normalizedLeft > normalizedRight) {
+    return 1;
+  }
+  return 0;
+}
+
 async function walkFiles(entryPath, files) {
   if (!isBundleHashInputPath(entryPath)) {
     return;
@@ -106,7 +118,7 @@ async function computeHash() {
       await walkFiles(inputPath, files);
     }
   }
-  files.sort((left, right) => normalizePath(left).localeCompare(normalizePath(right)));
+  files.sort(compareNormalizedPaths);
 
   const hash = createHash("sha256");
   for (const filePath of files) {
diff --git a/test/scripts/bundle-a2ui.test.ts b/test/scripts/bundle-a2ui.test.ts
index d40d4d4f2a1..1143b2e2e1e 100644
--- a/test/scripts/bundle-a2ui.test.ts
+++ b/test/scripts/bundle-a2ui.test.ts
@@ -1,6 +1,7 @@
 import path from "node:path";
 import { describe, expect, it } from "vitest";
 import {
+  compareNormalizedPaths,
   getLocalRolldownCliCandidates,
   isBundleHashInputPath,
 } from "../../scripts/bundle-a2ui.mjs";
@@ -36,4 +37,15 @@ describe("scripts/bundle-a2ui.mjs", () => {
       path.join(repoRoot, "node_modules", "rolldown", "bin", "cli.mjs"),
     );
   });
+
+  it("sorts hash inputs without locale-dependent collation", () => {
+    const paths = ["repo/Z.ts", "repo/a.ts", "repo/ä.ts", "repo/A.ts"];
+
+    expect([...paths].toSorted(compareNormalizedPaths)).toEqual([
+      "repo/A.ts",
+      "repo/Z.ts",
+      "repo/a.ts",
+      "repo/ä.ts",
+    ]);
+  });
 });