diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 2f8d266c27..50a0a296b3 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -437,13 +437,13 @@ static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
     av_bprint_init(bp, 0, -1);
 
     while (zstream.avail_in > 0) {
-        av_bprint_get_buffer(bp, 1, &buf, &buf_size);
-        if (!buf_size) {
+        av_bprint_get_buffer(bp, 2, &buf, &buf_size);
+        if (buf_size < 2) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }
         zstream.next_out  = buf;
-        zstream.avail_out = buf_size;
+        zstream.avail_out = buf_size - 1;
         ret = inflate(&zstream, Z_PARTIAL_FLUSH);
         if (ret != Z_OK && ret != Z_STREAM_END) {
             ret = AVERROR_EXTERNAL;