diff --git a/libavcodec/zmbv.c b/libavcodec/zmbv.c
index 4cc0476f4d..0a5bb40ad5 100644
--- a/libavcodec/zmbv.c
+++ b/libavcodec/zmbv.c
@@ -664,5 +664,5 @@ const AVCodec ff_zmbv_decoder = {
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
-    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };