diff --git a/objc/src/ZXing/CGImageLuminanceSource.mm b/objc/src/ZXing/CGImageLuminanceSource.mm
index 31b43ed18..f8b1edce6 100644
--- a/objc/src/ZXing/CGImageLuminanceSource.mm
+++ b/objc/src/ZXing/CGImageLuminanceSource.mm
@@ -50,7 +50,7 @@ CGImageRef CGImageLuminanceSource::createImageFromBuffer
     for(int y=0; y<height; y++) {
       memcpy(bytes+y*newBytesPerRow,
              baseAddress+left*4+(top+y)*bytesPerRow,
-             bytesPerRow);
+             newBytesPerRow);
     }
   }
   CVPixelBufferUnlockBaseAddress(buffer, 0);