diff --git a/AUTHORS b/AUTHORS
index 66d9201c2..c98d52286 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -4,6 +4,7 @@ PNG REFERENCE LIBRARY AUTHORS
 This is the list of PNG Reference Library ("libpng") Contributing
 Authors, for copyright and licensing purposes.
 
+ * Adam Richter
  * Andreas Dilger
  * Cosmin Truta
  * Dave Martindale
diff --git a/pngtrans.c b/pngtrans.c
index 1100f46eb..709345132 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -708,7 +708,7 @@ png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
        * forms produced on either GCC or MSVC.
        */
       int padding = PNG_PADBITS(row_info->pixel_depth, row_info->width);
-      png_bytep rp = png_ptr->row_buf + row_info->rowbytes - 1;
+      png_bytep rp = png_ptr->row_buf + row_info->rowbytes;
 
       switch (row_info->bit_depth)
       {