diff --git a/modules/video_coding/utility/vp9_uncompressed_header_parser.cc b/modules/video_coding/utility/vp9_uncompressed_header_parser.cc
index d8f24be0dc..867967ddc0 100644
--- a/modules/video_coding/utility/vp9_uncompressed_header_parser.cc
+++ b/modules/video_coding/utility/vp9_uncompressed_header_parser.cc
@@ -145,7 +145,10 @@ void Vp9ReadQp(BitstreamReader& br, Vp9UncompressedHeader* frame_info) {
   frame_info->is_lossless = frame_info->base_qp == 0;
   for (int i = 0; i < 3; ++i) {
     if (br.Read<bool>()) {  // if delta_coded
-      if (br.ReadBits(4) != 0) {
+      // delta_q is a signed integer with leading 4 bits containing absolute
+      // value and last bit containing sign. There are are two ways to represent
+      // zero with such encoding.
+      if ((br.ReadBits(5) & 0b1111'0) != 0) {  // delta_q
         frame_info->is_lossless = false;
       }
     }
diff --git a/modules/video_coding/utility/vp9_uncompressed_header_parser_unittest.cc b/modules/video_coding/utility/vp9_uncompressed_header_parser_unittest.cc
index be0a303708..d8cc738e07 100644
--- a/modules/video_coding/utility/vp9_uncompressed_header_parser_unittest.cc
+++ b/modules/video_coding/utility/vp9_uncompressed_header_parser_unittest.cc
@@ -72,7 +72,7 @@ TEST(Vp9UncompressedHeaderParserTest, FrameWithSegmentation) {
 TEST(Vp9UncompressedHeaderParserTest, SegmentationWithDefaultPredProbs) {
   const uint8_t kHeader[] = {0x90, 0x49, 0x83, 0x42, 0x80, 0x2e,
                              0x30, 0x0,  0xb0, 0x0,  0x37, 0xff,
-                             0xd,  0x0,  0x0,  0x0,  0x0,  0x0};
+                             0x06, 0x80, 0x0,  0x0,  0x0,  0x0};
   absl::optional<Vp9UncompressedHeader> frame_info =
       ParseUncompressedVp9Header(kHeader);
   ASSERT_TRUE(frame_info.has_value());
@@ -82,7 +82,7 @@ TEST(Vp9UncompressedHeaderParserTest, SegmentationWithDefaultPredProbs) {
 
 TEST(Vp9UncompressedHeaderParserTest, SegmentationWithSkipLevel) {
   const uint8_t kHeader[] = {0x90, 0x49, 0x83, 0x42, 0x80, 0x2e, 0x30, 0x00,
-                             0xb0, 0x00, 0x37, 0xff, 0x0d, 0x00, 0x02, 0x10,
+                             0xb0, 0x00, 0x37, 0xff, 0x06, 0x80, 0x01, 0x08,
                              0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
   absl::optional<Vp9UncompressedHeader> frame_info =
       ParseUncompressedVp9Header(kHeader);