From ff883dd6ce910e2a0aa301e1ee84d93f53cf8765 Mon Sep 17 00:00:00 2001
From: Loris Cro <kappaloris@gmail.com>
Date: Fri, 7 Nov 2025 12:42:51 +0100
Subject: [PATCH] fix single-threaded builds

---
 lib/std/Io/Threaded.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index b6ba5f9a82..999d7b93f5 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -490,7 +490,7 @@ fn async(
     start: *const fn (context: *const anyopaque, result: *anyopaque) void,
 ) ?*Io.AnyFuture {
     const t: *Threaded = @ptrCast(@alignCast(userdata));
-    if (t.cpu_count == 1) {
+    if (t.cpu_count == 1 or builtin.single_threaded) {
         start(context.ptr, result.ptr);
         return null;
     }