diff --git a/src/ImageSharp/Processing/Processors/Quantization/DefaultPixelSamplingStrategy.cs b/src/ImageSharp/Processing/Processors/Quantization/DefaultPixelSamplingStrategy.cs
index 5c387949e5..7be36014c6 100644
--- a/src/ImageSharp/Processing/Processors/Quantization/DefaultPixelSamplingStrategy.cs
+++ b/src/ImageSharp/Processing/Processors/Quantization/DefaultPixelSamplingStrategy.cs
@@ -137,7 +137,8 @@ public class DefaultPixelSamplingStrategy : IPixelSamplingStrategy
 
             for (int pos = 0; pos < totalNumberOfRows; pos++)
             {
-                int subPos = pos % denom;
+                Debug.Assert(denom > 0);
+                int subPos = (int)((uint)pos % (uint)denom);
                 if (subPos < num)
                 {
                     yield return GetRow(pos);