diff --git a/libavcodec/pixlet.c b/libavcodec/pixlet.c
index 4aa59f8f33..c4f7597866 100644
--- a/libavcodec/pixlet.c
+++ b/libavcodec/pixlet.c
@@ -173,7 +173,7 @@ static int read_low_coeffs(AVCodecContext *avctx, int16_t *dst, int size, int wi
             }
         }
 
-        if (i + rlen > size)
+        if (rlen > size - i)
             return AVERROR_INVALIDDATA;
         i += rlen;