diff --git a/src/bun.js/node/node_fs.zig b/src/bun.js/node/node_fs.zig
index 31c5d47fcb..8d725cf458 100644
--- a/src/bun.js/node/node_fs.zig
+++ b/src/bun.js/node/node_fs.zig
@@ -4771,8 +4771,8 @@ pub const NodeFS = struct {
 
                 break :brk switch (bun.sys.open(
                     path,
-                    bun.O.RDONLY | bun.O.NOCTTY,
-                    0,
+                    @intFromEnum(args.flag) | bun.O.NOCTTY,
+                    default_permission,
                 )) {
                     .err => |err| return .{
                         .err = err.withPath(if (args.path == .path) args.path.path.slice() else ""),
diff --git a/test/js/node/fs/fs.test.ts b/test/js/node/fs/fs.test.ts
index 315bfb8e0b..5f01425eee 100644
--- a/test/js/node/fs/fs.test.ts
+++ b/test/js/node/fs/fs.test.ts
@@ -597,7 +597,7 @@ describe("mkdirSync", () => {
         // @ts-expect-error
         { recursive: "lalala" },
       ),
-    ).toThrow("The \"recursive\" property must be of type boolean, got string");
+    ).toThrow('The "recursive" property must be of type boolean, got string');
   });
 });
 
@@ -1406,6 +1406,36 @@ describe("readFile", () => {
       });
     });
   });
+
+  it("works with flags", async () => {
+    const mydir = tempDirWithFiles("fs-read", {});
+    console.log(mydir);
+
+    for (const [flag, code] of [
+      ["a", "EBADF"],
+      ["ax", "EBADF"],
+      ["a+", undefined],
+      ["as", "EBADF"],
+      ["as+", undefined],
+      ["r", "ENOENT"],
+      ["rs", "ENOENT"],
+      ["r+", "ENOENT"],
+      ["rs+", "ENOENT"],
+      ["w", "EBADF"],
+      ["wx", "EBADF"],
+      ["w+", undefined],
+      ["wx+", undefined],
+    ]) {
+      const name = flag!.replace("+", "_plus") + ".txt";
+      if (code == null) {
+        expect(readFileSync(mydir + "/" + name, { encoding: "utf8", flag })).toBe("");
+        expect(readFileSync(mydir + "/" + name, { encoding: "utf8" })).toBe("");
+      } else {
+        expect.toThrowWithCode(() => readFileSync(mydir + "/" + name, { encoding: "utf8", flag }), code);
+        expect.toThrowWithCode(() => readFileSync(mydir + "/" + name, { encoding: "utf8" }), "ENOENT");
+      }
+    }
+  });
 });
 
 describe("writeFileSync", () => {