diff --git a/library/src/main/java/com/google/android/exoplayer/C.java b/library/src/main/java/com/google/android/exoplayer/C.java
index 3c9c679000..2efc751449 100644
--- a/library/src/main/java/com/google/android/exoplayer/C.java
+++ b/library/src/main/java/com/google/android/exoplayer/C.java
@@ -84,6 +84,22 @@ public final class C {
    */
   public static final int RESULT_END_OF_INPUT = -1;
 
+  /**
+   * A prefix for custom ExoPlayer WebVTT headers.
+   *
+   * @hide
+   */
+  public static final String WEBVTT_EXO_HEADER = "EXO-HEADER";
+
+  /**
+   * An element of a custom ExoPlayer WebVTT header. An {@code WEBVTT_OFFSET + value} element can
+   * be added to a custom ExoPlayer WebVTT header to specify an offset time (in microseconds) that
+   * should be subtracted from the embedded MPEGTS value.
+   *
+   * @hide
+   */
+  public static final String WEBVTT_EXO_HEADER_OFFSET = "OFFSET:";
+
   private C() {}
 
 }
diff --git a/library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java b/library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java
index c2927e4f50..0bee50176a 100644
--- a/library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java
+++ b/library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java
@@ -16,6 +16,7 @@
 package com.google.android.exoplayer.dash;
 
 import com.google.android.exoplayer.BehindLiveWindowException;
+import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.TimeRange;
 import com.google.android.exoplayer.TrackInfo;
@@ -43,7 +44,6 @@ import com.google.android.exoplayer.extractor.ChunkIndex;
 import com.google.android.exoplayer.extractor.Extractor;
 import com.google.android.exoplayer.extractor.mp4.FragmentedMp4Extractor;
 import com.google.android.exoplayer.extractor.webm.WebmExtractor;
-import com.google.android.exoplayer.text.webvtt.WebvttParser;
 import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.upstream.DataSpec;
 import com.google.android.exoplayer.util.Clock;
@@ -566,8 +566,9 @@ public class DashChunkSource implements ChunkSource {
       if (representationHolder.vttHeaderOffsetUs != presentationTimeOffsetUs) {
         // Update the VTT header.
         headerBuilder.setLength(0);
-        headerBuilder.append(WebvttParser.EXO_HEADER).append("=")
-            .append(WebvttParser.OFFSET).append(presentationTimeOffsetUs).append("\n");
+        headerBuilder.append(C.WEBVTT_EXO_HEADER).append("=")
+            .append(C.WEBVTT_EXO_HEADER_OFFSET).append(presentationTimeOffsetUs)
+            .append("\n");
         representationHolder.vttHeader = headerBuilder.toString().getBytes();
         representationHolder.vttHeaderOffsetUs = presentationTimeOffsetUs;
       }
diff --git a/library/src/main/java/com/google/android/exoplayer/text/webvtt/WebvttParser.java b/library/src/main/java/com/google/android/exoplayer/text/webvtt/WebvttParser.java
index 93b52c48aa..41dd74e2b6 100644
--- a/library/src/main/java/com/google/android/exoplayer/text/webvtt/WebvttParser.java
+++ b/library/src/main/java/com/google/android/exoplayer/text/webvtt/WebvttParser.java
@@ -40,22 +40,7 @@ import java.util.regex.Pattern;
  */
 public class WebvttParser implements SubtitleParser {
 
-  static final String TAG = "WebvttParser";
-
-  /**
-   * This parser allows a custom header to be prepended to the WebVTT data, in the form of a text
-   * line starting with this string.
-   *
-   * @hide
-   */
-  public static final String EXO_HEADER = "EXO-HEADER";
-  /**
-   * A {@code OFFSET + value} element can be added to the custom header to specify an offset time
-   * (in microseconds) that should be subtracted from the embedded MPEGTS value.
-   *
-   * @hide
-   */
-  public static final String OFFSET = "OFFSET:";
+  private static final String TAG = "WebvttParser";
 
   private static final long SAMPLING_RATE = 90;
 
@@ -73,7 +58,8 @@ public class WebvttParser implements SubtitleParser {
   private static final String WEBVTT_CUE_SETTING_STRING = "\\S*:\\S*";
   private static final Pattern WEBVTT_CUE_SETTING = Pattern.compile(WEBVTT_CUE_SETTING_STRING);
 
-  private static final Pattern MEDIA_TIMESTAMP_OFFSET = Pattern.compile(OFFSET + "\\d+");
+  private static final Pattern MEDIA_TIMESTAMP_OFFSET =
+      Pattern.compile(C.WEBVTT_EXO_HEADER_OFFSET + "\\d+");
   private static final Pattern MEDIA_TIMESTAMP = Pattern.compile("MPEGTS:\\d+");
 
   private static final String NON_NUMERIC_STRING = ".*[^0-9].*";
@@ -108,7 +94,7 @@ public class WebvttParser implements SubtitleParser {
       throw new ParserException("Expected WEBVTT or EXO-HEADER. Got null");
     }
 
-    if (line.startsWith(EXO_HEADER)) {
+    if (line.startsWith(C.WEBVTT_EXO_HEADER)) {
       // parse the timestamp offset, if present
       Matcher matcher = MEDIA_TIMESTAMP_OFFSET.matcher(line);
       if (matcher.find()) {