diff --git a/libavcodec/cinepakenc.c b/libavcodec/cinepakenc.c
index cc125ed39e..9eaa972a9c 100644
--- a/libavcodec/cinepakenc.c
+++ b/libavcodec/cinepakenc.c
@@ -1189,5 +1189,5 @@ AVCodec ff_cinepak_encoder = {
     .close          = cinepak_encode_end,
     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_RGB24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE },
     .priv_class     = &cinepak_class,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };