diff --git a/libavcodec/s302menc.c b/libavcodec/s302menc.c
index 2d0615bb2c..b9f35fb0cb 100644
--- a/libavcodec/s302menc.c
+++ b/libavcodec/s302menc.c
@@ -185,4 +185,5 @@ const AVCodec ff_s302m_encoder = {
                                                   AV_CH_LAYOUT_5POINT1_BACK,
                                                   AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX,
                                                   0 }, */
+    .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE,
 };