diff --git a/libavcodec/pamenc.c b/libavcodec/pamenc.c
index 10dbdf5589..f1df7c88f5 100644
--- a/libavcodec/pamenc.c
+++ b/libavcodec/pamenc.c
@@ -140,4 +140,5 @@ const AVCodec ff_pam_encoder = {
         AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
         AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
     },
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };