diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index 8d66cda701..6a5a2a3f5b 100644
--- a/libavformat/aiffdec.c
+++ b/libavformat/aiffdec.c
@@ -362,7 +362,7 @@ got_sound:
     if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
         av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
         st->codecpar->block_align = 35;
-    } else if (!st->codecpar->block_align) {
+    } else if (st->codecpar->block_align <= 0) {
         av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
         return -1;
     }