diff --git a/src/runtime/webcore/blob/Store.rs b/src/runtime/webcore/blob/Store.rs
index 15130252fdbc..d3a7ed83c97b 100644
--- a/src/runtime/webcore/blob/Store.rs
+++ b/src/runtime/webcore/blob/Store.rs
@@ -230,7 +230,7 @@ impl FileExt for File {
                     None,
                 ))
             }
-            PathOrFileDescriptor::Fd(_) => Ok(JSPromise::resolved_promise_value(
+            PathOrFileDescriptor::Fd(_) => Ok(JSPromise::rejected_promise(
                 cx.global(),
                 // `JSGlobalObject::create_invalid_args` lives in the still-gated
                 // `JSGlobalObject.rs`; `ERR_INVALID_ARG_TYPE` (lib.rs) is the
@@ -238,7 +238,8 @@ impl FileExt for File {
                 cx.global().ERR_INVALID_ARG_TYPE(format_args!(
                     "Is not possible to unlink a file descriptor"
                 )),
-            )),
+            )
+            .to_js()),
         }
     }
 }
diff --git a/test/js/web/fetch/blob-write.test.ts b/test/js/web/fetch/blob-write.test.ts
index 02d3111eb98b..2a45f53546af 100644
--- a/test/js/web/fetch/blob-write.test.ts
+++ b/test/js/web/fetch/blob-write.test.ts
@@ -1,4 +1,5 @@
 import { expect, test } from "bun:test";
+import { closeSync, openSync } from "fs";
 import { expectMaxObjectTypeCount, tempDir, tempDirWithFiles } from "harness";
 import path from "path";
 
@@ -55,6 +56,23 @@ test("Bun.file(path).delete() does not throw", async () => {
   expect(await Bun.file(path.join(dir, "a")).exists()).toBe(false);
 });
 
+// A file made from a descriptor has no path to unlink.
+test.each(["unlink", "delete"] as const)("Bun.file(fd).%s() rejects", async method => {
+  await using dir = tempDir("bun-unlink-fd", { a: "Hello, world!" });
+  const fd = openSync(path.join(dir, "a"), "r");
+  try {
+    const promise = Bun.file(fd)[method]();
+    await expect(promise).rejects.toBeInstanceOf(TypeError);
+    await expect(promise).rejects.toMatchObject({
+      code: "ERR_INVALID_ARG_TYPE",
+      message: "Is not possible to unlink a file descriptor",
+    });
+  } finally {
+    closeSync(fd);
+  }
+  expect(await Bun.file(path.join(dir, "a")).exists()).toBe(true);
+});
+
 test("blob.writer() throws for data-backed blob", () => {
   const blob = new Blob(["Hello, world!"]) as any;
   expect(() => blob.writer()).toThrowErrorMatchingInlineSnapshot(