diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c
index 46051e041d..ae184d7b5f 100644
--- a/libavcodec/dfa.c
+++ b/libavcodec/dfa.c
@@ -122,9 +122,7 @@ static int decode_dsw1(GetByteContext *gb, uint8_t *frame, int width, int height
             count = ((v >> 13) + 2) << 1;
             if (frame - frame_start < offset || frame_end - frame < count)
                 return AVERROR_INVALIDDATA;
-            // can't use av_memcpy_backptr() since it can overwrite following pixels
-            for (v = 0; v < count; v++)
-                frame[v] = frame[v - offset];
+            av_memcpy_backptr(frame, offset, count);
             frame += count;
         } else if (bitbuf & (mask << 1)) {
             frame += bytestream2_get_le16(gb);