diff --git a/libavcodec/rpza.c b/libavcodec/rpza.c
index a9aeac59fe..270cfcc979 100644
--- a/libavcodec/rpza.c
+++ b/libavcodec/rpza.c
@@ -296,4 +296,5 @@ const AVCodec ff_rpza_decoder = {
     .close          = rpza_decode_end,
     .decode         = rpza_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };