diff --git a/libavcodec/qdrw.c b/libavcodec/qdrw.c
index 65279c9805..c04c756d71 100644
--- a/libavcodec/qdrw.c
+++ b/libavcodec/qdrw.c
@@ -369,7 +369,7 @@ static int decode_frame(AVCodecContext *avctx,
             bytestream2_skip(&gbc, 18);
             colors = bytestream2_get_be16(&gbc);
 
-            if (colors < 0 || colors > 256) {
+            if (colors < 0 || colors > 255) {
                 av_log(avctx, AV_LOG_ERROR,
                        "Error color count - %i(0x%X)\n", colors, colors);
                 return AVERROR_INVALIDDATA;