diff --git a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/Representation.java b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/Representation.java
index f17ec5477b..b31ad939a5 100644
--- a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/Representation.java
+++ b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/Representation.java
@@ -63,7 +63,7 @@ public abstract class Representation {
   /** Supplemental properties in the adaptation set. May be empty. */
   public final List<Descriptor> supplementalProperties;
 
-  private final RangedUri initializationUri;
+  @Nullable private final RangedUri initializationUri;
 
   /**
    * Constructs a new instance.
diff --git a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/SegmentBase.java b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/SegmentBase.java
index 637461f3f7..01d201e6a3 100644
--- a/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/SegmentBase.java
+++ b/libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/SegmentBase.java
@@ -29,6 +29,7 @@ import com.google.common.math.BigIntegerMath;
 import java.math.BigInteger;
 import java.math.RoundingMode;
 import java.util.List;
+import org.checkerframework.checker.initialization.qual.UnderInitialization;
 
 /** An approximate representation of a SegmentBase manifest element. */
 @UnstableApi
@@ -60,7 +61,8 @@ public abstract class SegmentBase {
    * @return A {@link RangedUri} defining the location of the initialization data, or null.
    */
   @Nullable
-  public RangedUri getInitialization(Representation representation) {
+  public RangedUri getInitialization(
+      @UnderInitialization(Representation.class) Representation representation) {
     return initialization;
   }