diff --git a/bgratransform.pas b/bgratransform.pas
index 3570691..eb74a04 100644
--- a/bgratransform.pas
+++ b/bgratransform.pas
@@ -1469,8 +1469,8 @@ procedure TBGRAAffineBitmapTransform.ScanPutPixels(pdest: PBGRAPixel;
 
   if FResampleFilter = rfBox then
   begin
-    posXPrecision := posXPrecision +(posXPrecision +(Precision shr 1));
-    posYPrecision := posYPrecision +(posYPrecision +(Precision shr 1));
+    posXPrecision := posXPrecision + (Precision shr 1);
+    posYPrecision := posYPrecision + (Precision shr 1);
     py0 := PByte(FBitmap.ScanLine[0]);
     if FBitmap.LineOrder = riloTopToBottom then
       deltaRow := FBitmap.Width*sizeof(TBGRAPixel) else