diff --git a/libavcodec/g723_1dec.c b/libavcodec/g723_1dec.c
index 3b052f3801..7d75adbd7a 100644
--- a/libavcodec/g723_1dec.c
+++ b/libavcodec/g723_1dec.c
@@ -1120,4 +1120,5 @@ const AVCodec ff_g723_1_decoder = {
     .decode         = g723_1_decode_frame,
     .capabilities   = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
     .priv_class     = &g723_1dec_class,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };