diff --git a/src/aio.zig b/src/aio.zig
index c1d9496..92509fd 100644
--- a/src/aio.zig
+++ b/src/aio.zig
@@ -138,6 +138,29 @@ pub const ChildExit = ops.ChildExit;
 pub const Socket = ops.Socket;
 pub const CloseSocket = ops.CloseSocket;
 
+test "shared outputs" {
+    var tmp = std.testing.tmpDir(.{});
+    defer tmp.cleanup();
+    var f = try tmp.dir.createFile("test", .{});
+    defer f.close();
+    var id1: Id = @enumFromInt(69);
+    var id2: Id = undefined;
+    var id3: Id = undefined;
+    var counter1: u16 = 0;
+    var counter2: u16 = 2;
+    try multi(.{
+        Fsync{ .file = f, .out_id = &id1, .counter = .{ .inc = &counter1 } },
+        Fsync{ .file = f, .out_id = &id2, .counter = .{ .inc = &counter1 } },
+        Fsync{ .file = f, .out_id = &id3, .counter = .{ .dec = &counter2 } },
+    });
+    try std.testing.expect(id1 != @as(Id, @enumFromInt(69)));
+    try std.testing.expect(id1 != id2);
+    try std.testing.expect(id1 != id3);
+    try std.testing.expect(id2 != id3);
+    try std.testing.expect(counter1 == 2);
+    try std.testing.expect(counter2 == 1);
+}
+
 test "Fsync" {
     var tmp = std.testing.tmpDir(.{});
     defer tmp.cleanup();
diff --git a/src/aio/linux.zig b/src/aio/linux.zig
index fdd9f74..b482527 100644
--- a/src/aio/linux.zig
+++ b/src/aio/linux.zig
@@ -63,7 +63,7 @@ pub fn complete(self: *@This(), mode: aio.Dynamic.CompletionMode) aio.Completion
 }
 
 pub fn immediate(comptime len: u16, work: anytype) aio.ImmediateError!aio.CompletionResult {
-    var io = try uring_init(len);
+    var io = try uring_init(try std.math.ceilPowerOfTwo(u16, len));
     defer io.deinit();
     inline for (&work.ops, 0..) |*op, idx| try uring_queue(&io, op, idx);
     var num = try uring_submit(&io);