diff --git a/libraries/datasource/src/main/java/androidx/media3/datasource/HttpDataSource.java b/libraries/datasource/src/main/java/androidx/media3/datasource/HttpDataSource.java
index 55afcf273e..4f755b6ed1 100644
--- a/libraries/datasource/src/main/java/androidx/media3/datasource/HttpDataSource.java
+++ b/libraries/datasource/src/main/java/androidx/media3/datasource/HttpDataSource.java
@@ -418,7 +418,7 @@ public interface HttpDataSource extends DataSource {
     @Nullable public final String responseMessage;
 
     /** An unmodifiable map of the response header fields and values. */
-    public final Map<String, List<String>> headerFields;
+    @UnstableApi public final Map<String, List<String>> headerFields;
 
     /** The response body. */
     public final byte[] responseBody;