diff --git a/modules/video_coding/codecs/av1/libaom_av1_encoder.cc b/modules/video_coding/codecs/av1/libaom_av1_encoder.cc
index 9f33acf24e..4d94eed5b0 100644
--- a/modules/video_coding/codecs/av1/libaom_av1_encoder.cc
+++ b/modules/video_coding/codecs/av1/libaom_av1_encoder.cc
@@ -631,8 +631,7 @@ int32_t LibaomAv1Encoder::Encode(
       (absl::c_find(supported_formats, mapped_buffer->type()) ==
            supported_formats.end() &&
        mapped_buffer->type() != VideoFrameBuffer::Type::kI420A)) {
-    rtc::scoped_refptr<I420BufferInterface> converted_buffer(
-        mapped_buffer->ToI420());
+    rtc::scoped_refptr<I420BufferInterface> converted_buffer(buffer->ToI420());
     if (!converted_buffer) {
       RTC_LOG(LS_ERROR) << "Failed to convert "
                         << VideoFrameBufferTypeToString(