diff --git a/libavcodec/cinepak.c b/libavcodec/cinepak.c
index 9c5b254231..17148a3577 100644
--- a/libavcodec/cinepak.c
+++ b/libavcodec/cinepak.c
@@ -522,4 +522,5 @@ AVCodec ff_cinepak_decoder = {
     .close          = cinepak_decode_end,
     .decode         = cinepak_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };