diff --git a/library/core/src/main/java/com/google/android/exoplayer2/text/ttml/TtmlDecoder.java b/library/core/src/main/java/com/google/android/exoplayer2/text/ttml/TtmlDecoder.java
index 6dabcdd904..4bba366e44 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/text/ttml/TtmlDecoder.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/text/ttml/TtmlDecoder.java
@@ -488,20 +488,19 @@ public final class TtmlDecoder extends SimpleSubtitleDecoder {
         case TtmlNode.ATTR_TTS_TEXT_ALIGN:
           switch (Util.toLowerInvariant(attributeValue)) {
             case TtmlNode.LEFT:
-              style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_NORMAL);
-              break;
             case TtmlNode.START:
               style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_NORMAL);
               break;
             case TtmlNode.RIGHT:
-              style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_OPPOSITE);
-              break;
             case TtmlNode.END:
               style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_OPPOSITE);
               break;
             case TtmlNode.CENTER:
               style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_CENTER);
               break;
+            default:
+              // ignore
+              break;
           }
           break;
         case TtmlNode.ATTR_TTS_TEXT_DECORATION: