diff --git a/src/libply/ply-frame-buffer.c b/src/libply/ply-frame-buffer.c
index 78f929b1..9f13fea3 100644
--- a/src/libply/ply-frame-buffer.c
+++ b/src/libply/ply-frame-buffer.c
@@ -651,7 +651,7 @@ ply_frame_buffer_fill_with_argb32_data_at_opacity (ply_frame_buffer_t      *buff
         {
           uint32_t pixel_value;
 
-          pixel_value = data[cropped_area.width * row + column];
+          pixel_value = data[area->width * row + column];
           pixel_value = make_pixel_value_translucent (pixel_value, opacity_as_byte);
           ply_frame_buffer_blend_value_at_pixel (buffer,
                                                  cropped_area.x + (column - x),