diff --git a/src/core/raster/qgsrasterlayer.cpp b/src/core/raster/qgsrasterlayer.cpp
index 669b9fc79558..de919fa9a9b4 100644
--- a/src/core/raster/qgsrasterlayer.cpp
+++ b/src/core/raster/qgsrasterlayer.cpp
@@ -4940,7 +4940,7 @@ bool QgsRasterImageBuffer::createNextPartImage()
   //create the QImage
   if ( mWritingEnabled )
   {
-    mCurrentImage = new QImage( xSize, ySize, QImage::Format_ARGB32 );
+    mCurrentImage = new QImage( xSize, rasterYSize, QImage::Format_ARGB32 );
     mCurrentImage->fill( qRgba( 255, 255, 255, 0 ) );
   }
   else