1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/zerocodec.c b/libavcodec/zerocodec.c
index 4944a3e486..8fd8da645f 100644
--- a/libavcodec/zerocodec.c
+++ b/libavcodec/zerocodec.c
@@ -65,8 +65,8 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
         pic->key_frame = 1;
         pic->pict_type = AV_PICTURE_TYPE_I;
     } else {
-        if (prev == NULL) {
-            av_log(avctx, AV_LOG_ERROR, "No previous frame!\n");
+        if (!prev) {
+            av_log(avctx, AV_LOG_ERROR, "Missing reference frame!\n");
             return AVERROR_INVALIDDATA;
         }
         pic->key_frame = 0;