diff --git a/libavcodec/qcelpdec.c b/libavcodec/qcelpdec.c
index 6663d8588b..b23013816b 100644
--- a/libavcodec/qcelpdec.c
+++ b/libavcodec/qcelpdec.c
@@ -799,4 +799,5 @@ const AVCodec ff_qcelp_decoder = {
     .decode         = qcelp_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
     .priv_data_size = sizeof(QCELPContext),
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };