diff --git a/libavcodec/pcxenc.c b/libavcodec/pcxenc.c
index 4cba1019e6..96132105f1 100644
--- a/libavcodec/pcxenc.c
+++ b/libavcodec/pcxenc.c
@@ -205,4 +205,5 @@ const AVCodec ff_pcx_encoder = {
         AV_PIX_FMT_MONOBLACK,
         AV_PIX_FMT_NONE
     },
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };