diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 17937ad928..eab382e74f 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1028,7 +1028,7 @@ static int read_block(ALSDecContext *ctx, ALSBlockData *bd)
 
     *bd->shift_lsbs = 0;
 
-    if (get_bits_left(gb) < 1)
+    if (get_bits_left(gb) < 7)
         return AVERROR_INVALIDDATA;
 
     // read block type flag and read the samples accordingly