diff --git a/libavutil/hwcontext_rkmpp.c b/libavutil/hwcontext_rkmpp.c
index c0a14bf6d2..7800651176 100644
--- a/libavutil/hwcontext_rkmpp.c
+++ b/libavutil/hwcontext_rkmpp.c
@@ -183,7 +183,7 @@ static int rkmpp_get_aligned_linesize(enum AVPixelFormat pix_fmt, int width, int
 
     if (is_packed_fmt) {
         const int pixel_width = av_get_padded_bits_per_pixel(pixdesc) / 8;
-        linesize = FFALIGN(linesize / pixel_width, 8) * pixel_width;
+        linesize = FFALIGN(linesize / pixel_width, 16) * pixel_width;
     } else if (is_yuv && is_fully_planar) {
         linesize = FFALIGN(linesize, 16 >> (plane ? pixdesc->log2_chroma_w : 0));
     } else