diff --git a/libavcodec/zmbvenc.c b/libavcodec/zmbvenc.c
index d0c353d0df..b431476241 100644
--- a/libavcodec/zmbvenc.c
+++ b/libavcodec/zmbvenc.c
@@ -442,5 +442,5 @@ const AVCodec ff_zmbv_encoder = {
 #endif //ZMBV_ENABLE_24BPP
                                                      AV_PIX_FMT_BGR0,
                                                      AV_PIX_FMT_NONE },
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };