diff --git a/headers/private/graphics/intel_extreme/intel_extreme.h b/headers/private/graphics/intel_extreme/intel_extreme.h
index b922e20645..b9e8cb8636 100644
--- a/headers/private/graphics/intel_extreme/intel_extreme.h
+++ b/headers/private/graphics/intel_extreme/intel_extreme.h
@@ -395,12 +395,13 @@ struct overlay_registers {
 
 	uint32 _reserved21[10];
 
-	// (0xa0) FASTHSCALE - fast horizontal downscale
-	uint16 horizontal_scale_rgb;
+	// (0xa0) FASTHSCALE - fast horizontal downscale (strangely enough,
+	// the next two registers switch the usual Y/RGB vs. UV order)
 	uint16 horizontal_scale_uv;
+	uint16 horizontal_scale_rgb;
 	// (0xa4) UVSCALEV - vertical downscale
-	uint16 vertical_scale_rgb;
 	uint16 vertical_scale_uv;
+	uint16 vertical_scale_rgb;
 
 	uint32 _reserved22[86];
 
diff --git a/src/add-ons/accelerants/intel_extreme/overlay.cpp b/src/add-ons/accelerants/intel_extreme/overlay.cpp
index 1fdbae747e..e4af605fa2 100644
--- a/src/add-ons/accelerants/intel_extreme/overlay.cpp
+++ b/src/add-ons/accelerants/intel_extreme/overlay.cpp
@@ -562,8 +562,8 @@ intel_configure_overlay(overlay_token overlayToken, const overlay_buffer *buffer
 		registers->window_width = right - left;
 		registers->window_height = bottom - top;
 
-		uint32 horizontalScale = ((view->width - 1) << 12) / window->width;
-		uint32 verticalScale = ((view->height - 1) << 12) / window->height;
+		uint32 horizontalScale = (view->width << 12) / window->width;
+		uint32 verticalScale = (view->height << 12) / window->height;
 		uint32 horizontalScaleUV = horizontalScale >> 1;
 		uint32 verticalScaleUV = verticalScale >> 1;
 		horizontalScale = horizontalScaleUV << 1;