diff --git a/libavcodec/ilbcdec.c b/libavcodec/ilbcdec.c
index a23b697806..3df46b242f 100644
--- a/libavcodec/ilbcdec.c
+++ b/libavcodec/ilbcdec.c
@@ -1486,4 +1486,5 @@ const AVCodec ff_ilbc_decoder = {
     .decode         = ilbc_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
     .priv_data_size = sizeof(ILBCContext),
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };