diff --git a/libavcodec/sonic.c b/libavcodec/sonic.c
index b31258eaa1..2ed57586c8 100644
--- a/libavcodec/sonic.c
+++ b/libavcodec/sonic.c
@@ -1095,7 +1095,7 @@ const AVCodec ff_sonic_encoder = {
     .encode2        = sonic_encode_frame,
     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
     .capabilities   = AV_CODEC_CAP_EXPERIMENTAL,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
     .close          = sonic_encode_close,
 };
 #endif
@@ -1111,7 +1111,7 @@ const AVCodec ff_sonic_ls_encoder = {
     .encode2        = sonic_encode_frame,
     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
     .capabilities   = AV_CODEC_CAP_EXPERIMENTAL,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
     .close          = sonic_encode_close,
 };
 #endif