diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 2f6772efd85f3197c4aad3b1ac02ad5819a48dfc..1c7d848aaeaec3e5abce81b4c68acda6b20b2daf 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -11085,6 +11085,13 @@ fn timestampFromPosix(timespec: *const posix.timespec) Io.Timestamp {
 }
 
 fn timestampToPosix(nanoseconds: i96) posix.timespec {
+    if (builtin.zig_backend == .stage2_wasm) {
+        // Workaround for https://codeberg.org/ziglang/zig/issues/30575
+        return .{
+            .sec = @intCast(@divTrunc(nanoseconds, std.time.ns_per_s)),
+            .nsec = @intCast(@rem(nanoseconds, std.time.ns_per_s)),
+        };
+    }
     return .{
         .sec = @intCast(@divFloor(nanoseconds, std.time.ns_per_s)),
         .nsec = @intCast(@mod(nanoseconds, std.time.ns_per_s)),