diff --git a/src/json_export.zig b/src/json_export.zig
index 848cb83..5ac8db3 100644
--- a/src/json_export.zig
+++ b/src/json_export.zig
@@ -143,7 +143,7 @@ pub const Writer = struct {
         ctx.* = .{ .fd = out };
         if (main.config.compress) ctx.zstd = ZstdWriter.create();
         ctx.write("[1,2,{\"progname\":\"ncdu\",\"progver\":\"" ++ main.program_version ++ "\",\"timestamp\":");
-        ctx.writeUint(@intCast(@max(0, std.time.timestamp())));
+        ctx.writeUint(@intCast(@max(0, std.Io.Timestamp.now(main.io, .real).toSeconds())));
         ctx.writeByte('}');
         return ctx;
     }