diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 1f7ca8f71c..115de6087f 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -283,9 +283,6 @@ static int parse_frame_header(AC3DecodeContext *s)
     if(err)
         return err;
 
-    if(hdr.bitstream_id > 10)
-        return AC3_PARSE_ERROR_BSID;
-
     /* get decoding parameters from header info */
     s->bit_alloc_params.sr_code     = hdr.sr_code;
     s->channel_mode                 = hdr.channel_mode;
@@ -310,6 +307,9 @@ static int parse_frame_header(AC3DecodeContext *s)
         s->channel_in_cpl[s->lfe_ch] = 0;
     }
 
+    if(hdr.bitstream_id > 10)
+        return AC3_PARSE_ERROR_BSID;
+
     return ac3_parse_header(s);
 }