diff --git a/src/macos/system.zig b/src/macos/system.zig
index 179d34b..cc4bc20 100644
--- a/src/macos/system.zig
+++ b/src/macos/system.zig
@@ -35,7 +35,7 @@ pub fn getLocale(allocator: std.mem.Allocator, environ: std.process.Environ) ![]
 /// Returns the system uptime.
 ///
 /// Uses `sysctl` to fetch the system boot time and calculates the elapsed time.
-pub fn getSystemUptime() !SystemUptime {
+pub fn getSystemUptime(io: std.Io) !SystemUptime {
     const seconds_per_day: f64 = 86400.0;
     const hours_per_day: f64 = 24.0;
     const seconds_per_hour: f64 = 3600.0;
@@ -49,7 +49,7 @@ pub fn getSystemUptime() !SystemUptime {
     var name = [_]c_int{ c_sysctl.CTL_KERN, c_sysctl.KERN_BOOTTIME };
     if (c_sysctl.sysctl(&name, name.len, &boot_time, &size, null, 0) == 0) {
         const boot_seconds = @as(f64, @floatFromInt(boot_time.tv_sec));
-        const now_seconds = @as(f64, @floatFromInt(std.time.timestamp()));
+        const now_seconds = @as(f64, @floatFromInt(std.Io.Timestamp.now(io, .real).toSeconds()));
         uptime_seconds = now_seconds - boot_seconds;
     } else {
         return error.UnableToGetSystemUptime;