diff --git a/src/js_printer.zig b/src/js_printer.zig
index 09b3bfdbbf8d4..486f94e23bb50 100644
--- a/src/js_printer.zig
+++ b/src/js_printer.zig
@@ -6036,7 +6036,8 @@ pub fn printWithWriterAndPlatform(
     comptime generate_source_maps: bool,
 ) PrintResult {
     const PrinterType = NewPrinter(
-        false,
+        // if it's bun, it is also ascii_only
+        is_bun_platform,
         Writer,
         false,
         is_bun_platform,
diff --git a/test/bundler/bundler_compile.test.ts b/test/bundler/bundler_compile.test.ts
index 70c2827656d00..1fdada5873270 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
new file mode 100644
index 0000000000000..9177085602db2
--- /dev/null
+++ b/test/regression/issue/09559.test.ts
@@ -0,0 +1,24 @@
+import { $ } from "bun";
+import { expect, test } from "bun:test";
+import { bunEnv, bunExe, tempDirWithFiles } from "harness";
+import { readdirSync } from "node:fs";
+import { join } from "path";
+
+test("bun build --target bun should support non-ascii source", async () => {
+  const files = {
+    "index.js": `
+    console.log(JSON.stringify({\u{6211}: "a"}));
+
+    const \u{6211} = "b";
+    console.log(JSON.stringify({\u{6211}}));
+  `,
+  };
+  const filenames = Object.keys(files);
+  const source = tempDirWithFiles("source", files);
+
+  $.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(`{"\u{6211}":"a"}\n{"\u{6211}":"b"}\n`);
+});