diff --git a/libavcodec/aac.c b/libavcodec/aac.c
index 5c58f97ce9..ad5de7c5c7 100644
--- a/libavcodec/aac.c
+++ b/libavcodec/aac.c
@@ -1687,6 +1687,8 @@ static int parse_adts_frame_header(AACContext *ac, GetBitContext *gb)
         } else if (ac->output_configured != OC_LOCKED) {
             ac->output_configured = OC_NONE;
         }
+        if (ac->output_configured != OC_LOCKED)
+            ac->m4ac.sbr = -1;
         ac->m4ac.sample_rate     = hdr_info.sample_rate;
         ac->m4ac.sampling_index  = hdr_info.sampling_index;
         ac->m4ac.object_type     = hdr_info.object_type;