diff --git a/Assets/Scripts/Core/Fsr3UpscalerContext.cs b/Assets/Scripts/Core/Fsr3UpscalerContext.cs
index 54fb83b..3dccb54 100644
--- a/Assets/Scripts/Core/Fsr3UpscalerContext.cs
+++ b/Assets/Scripts/Core/Fsr3UpscalerContext.cs
@@ -273,8 +273,8 @@ namespace FidelityFX
                 
                 // Dispatch RCAS
                 const int threadGroupWorkRegionDimRcas = 16;
-                int threadGroupsX = (Screen.width + threadGroupWorkRegionDimRcas - 1) / threadGroupWorkRegionDimRcas;
-                int threadGroupsY = (Screen.height + threadGroupWorkRegionDimRcas - 1) / threadGroupWorkRegionDimRcas;
+                int threadGroupsX = (UpscalerConsts.upscaleSize.x + threadGroupWorkRegionDimRcas - 1) / threadGroupWorkRegionDimRcas;
+                int threadGroupsY = (UpscalerConsts.upscaleSize.y + threadGroupWorkRegionDimRcas - 1) / threadGroupWorkRegionDimRcas;
                 _sharpenPass.ScheduleDispatch(commandBuffer, dispatchParams, frameIndex, threadGroupsX, threadGroupsY);
             }