diff --git a/Robust.Shared/Timing/PrecisionSleep.cs b/Robust.Shared/Timing/PrecisionSleep.cs
index 1bb10571f60..525baa37273 100644
--- a/Robust.Shared/Timing/PrecisionSleep.cs
+++ b/Robust.Shared/Timing/PrecisionSleep.cs
@@ -69,9 +69,8 @@ public PrecisionSleepWindowsHighResolution()
     public override void Sleep(TimeSpan time)
     {
         LARGE_INTEGER due;
-        Windows.GetSystemTimeAsFileTime((FILETIME*)(&due));
-
-        due.QuadPart += time.Ticks;
+        // negative = relative time.
+        due.QuadPart = -time.Ticks;
 
         var success = Windows.SetWaitableTimer(
             _timerHandle,