diff --git a/src/BufferCopy/BlueNoiseTexture.h b/src/BufferCopy/BlueNoiseTexture.h
index cc4bb542..748361b8 100644
--- a/src/BufferCopy/BlueNoiseTexture.h
+++ b/src/BufferCopy/BlueNoiseTexture.h
@@ -2,7 +2,7 @@
 
 struct BlueNoiseItem
 {
-	char r, g, b;
+	signed char r, g, b;
 };
 
 extern const BlueNoiseItem blueNoiseTex[8][64][64];