diff --git a/lib/cea/mp4_cea_parser.js b/lib/cea/mp4_cea_parser.js
index d89dcd5472..fb538e3a28 100644
--- a/lib/cea/mp4_cea_parser.js
+++ b/lib/cea/mp4_cea_parser.js
@@ -216,7 +216,7 @@ shaka.cea.Mp4CeaParser = class {
               box.version != null,
               'TFDT is a full box and should have a valid version.');
 
-          const parsedTFDT = shaka.util.Mp4BoxParsers.parseTFDT(
+          const parsedTFDT = shaka.util.Mp4BoxParsers.parseTFDTInaccurate(
               box.reader, box.version);
 
           baseMediaDecodeTime = parsedTFDT.baseMediaDecodeTime;
diff --git a/lib/text/mp4_vtt_parser.js b/lib/text/mp4_vtt_parser.js
index 90f34eba08..e8ca45be06 100644
--- a/lib/text/mp4_vtt_parser.js
+++ b/lib/text/mp4_vtt_parser.js
@@ -135,7 +135,7 @@ shaka.text.Mp4VttParser = class {
               box.version == 0 || box.version == 1,
               'TFDT version can only be 0 or 1');
 
-          const parsedTFDTBox = shaka.util.Mp4BoxParsers.parseTFDT(
+          const parsedTFDTBox = shaka.util.Mp4BoxParsers.parseTFDTInaccurate(
               box.reader, box.version);
           baseTime = parsedTFDTBox.baseMediaDecodeTime;
         })