diff --git a/dom/media/platforms/agnostic/AOMDecoder.cpp b/dom/media/platforms/agnostic/AOMDecoder.cpp
index f3e8c7450b..3ab5004e33 100644
--- a/dom/media/platforms/agnostic/AOMDecoder.cpp
+++ b/dom/media/platforms/agnostic/AOMDecoder.cpp
@@ -215,7 +215,6 @@ bool
 AOMDecoder::IsKeyframe(Span<const uint8_t> aBuffer) {
   aom_codec_stream_info_t info;
   PodZero(&info);
-  info.sz = sizeof(info);
 
   aom_codec_peek_stream_info(aom_codec_av1_dx(),
                              aBuffer.Elements(),
@@ -230,7 +229,6 @@ nsIntSize
 AOMDecoder::GetFrameSize(Span<const uint8_t> aBuffer) {
   aom_codec_stream_info_t info;
   PodZero(&info);
-  info.sz = sizeof(info);
 
   aom_codec_peek_stream_info(aom_codec_av1_dx(),
                              aBuffer.Elements(),