diff --git a/libavformat/gifdec.c b/libavformat/gifdec.c
index a31644c2a8..d617de5f41 100644
--- a/libavformat/gifdec.c
+++ b/libavformat/gifdec.c
@@ -144,7 +144,7 @@ static int gif_read_header(AVFormatContext *s)
                 AVBPrint bp;
                 int block_size;
 
-                av_bprint_init(&bp, 0, -1);
+                av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
                 while ((block_size = avio_r8(pb)) != 0) {
                     avio_read_to_bprint(pb, &bp, block_size);
                 }