diff --git a/lib/media/media_source_engine.js b/lib/media/media_source_engine.js
index ab61a64d28..8d2a7792d5 100644
--- a/lib/media/media_source_engine.js
+++ b/lib/media/media_source_engine.js
@@ -1778,6 +1778,9 @@ shaka.media.MediaSourceEngine = class {
    * @private
    */
   async codecSwitchIfNecessary_(contentType, stream, streamsByType) {
+    if (contentType == shaka.util.ManifestParserUtils.ContentType.TEXT) {
+      return false;
+    }
     const MimeUtils = shaka.util.MimeUtils;
     const currentCodec = MimeUtils.getCodecBase(
         MimeUtils.getCodecs(this.sourceBufferTypes_[contentType]));
@@ -1840,6 +1843,9 @@ shaka.media.MediaSourceEngine = class {
    * @private
    */
   isCodecSwitchNecessary_(contentType, stream) {
+    if (contentType == shaka.util.ManifestParserUtils.ContentType.TEXT) {
+      return false;
+    }
     const MimeUtils = shaka.util.MimeUtils;
     const currentCodec = MimeUtils.getCodecBase(
         MimeUtils.getCodecs(this.sourceBufferTypes_[contentType]));