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diff --git a/coders/png.c b/coders/png.c
index 7e8be2c0a1ac5c08cc744596d74006d893c712c1..a91a3fe92d6ceec828c3ae3e76a1faa29b6df8d1 100644 (file)
--- a/coders/png.c
+++ b/coders/png.c
@@ -5319,7 +5319,7 @@ static Image *ReadMNGImage(const ImageInfo *image_info,ExceptionInfo *exception)
                 if (image->rows > 1)
                    magnified_height += mng_info->magn_mb;
                 if (image->rows > 2)
-                   magnified_height += (image->rows-2)*(mng_info->magn_my);
+                   magnified_height += (png_uint_32) ((image->rows-2)*(mng_info->magn_my));
               }
             else
               {