diff --git a/test/bundler/bundler_compile.test.ts b/test/bundler/bundler_compile.test.ts
index 70c2827656d003..1fdada5873270b 100644
--- a/test/bundler/bundler_compile.test.ts
+++ b/test/bundler/bundler_compile.test.ts
@@ -220,4 +220,13 @@ describe("bundler", () => {
     },
     run: { stdout: "Hello, world!", setCwd: true },
   });
+  itBundled("compile/Utf8", {
+    compile: true,
+    files: {
+      "/entry.ts": /* js */ `
+        console.log(JSON.stringify({\u{6211}: "\u{6211}"}));
+      `,
+    },
+    run: { stdout: '{"\u{6211}":"\u{6211}"}' },
+  });
 });
diff --git a/test/regression/issue/09559.test.ts b/test/regression/issue/09559.test.ts
index 329033b584a295..4e80c91302d06e 100644
--- a/test/regression/issue/09559.test.ts
+++ b/test/regression/issue/09559.test.ts
@@ -6,10 +6,10 @@ import { join } from "path";
 
 test("bun build --target bun should support non-ascii source", async () => {
   const files = {"index.js": `
-    console.log(JSON.stringify({我: "a"}));
+    console.log(JSON.stringify({\u{6211}: "a"}));
 
     const 我 = "b";
-    console.log(JSON.stringify({我}));
+    console.log(JSON.stringify({\u{6211}}));
   `};
   const filenames = Object.keys(files);
   const source = tempDirWithFiles("source", files);
@@ -17,6 +17,6 @@ test("bun build --target bun should support non-ascii source", async () => {
   $.throws(true);
   await $`${bunExe()} build --target bun ${join(source, "index.js")} --outfile ${join(source, "bundle.js")}`;
   const result = await $`${bunExe()} ${join(source, "bundle.js")}`.text();
-  
-  expect(result).toBe(`{"我":"a"}\n{"我":"b"}\n`);
+
+  expect(result).toBe(`{"\u{6211}":"a"}\n{"\u{6211}":"b"}\n`);
 })