diff --git a/libavcodec/vulkan_encode_h264.c b/libavcodec/vulkan_encode_h264.c
index a0a00a3db2..cdc87fb4ca 100644
--- a/libavcodec/vulkan_encode_h264.c
+++ b/libavcodec/vulkan_encode_h264.c
@@ -16,6 +16,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/internal.h"
 #include "libavutil/opt.h"
 #include "libavutil/mem.h"
 
@@ -1144,7 +1145,7 @@ static int init_base_units(AVCodecContext *avctx)
         if (!data)
             return AVERROR(ENOMEM);
     } else {
-        av_log(avctx, AV_LOG_ERROR, "Unable to get feedback for H.264 units = %lu\n", data_size);
+        av_log(avctx, AV_LOG_ERROR, "Unable to get feedback for H.264 units = %"SIZE_SPECIFIER"\n", data_size);
         return err;
     }