diff --git a/libraries/session/src/main/java/androidx/media3/session/MediaController.java b/libraries/session/src/main/java/androidx/media3/session/MediaController.java
index df08acc7b9..2cdbba2276 100644
--- a/libraries/session/src/main/java/androidx/media3/session/MediaController.java
+++ b/libraries/session/src/main/java/androidx/media3/session/MediaController.java
@@ -15,6 +15,7 @@
  */
 package androidx.media3.session;
 
+import static androidx.annotation.VisibleForTesting.NONE;
 import static androidx.media3.common.util.Assertions.checkArgument;
 import static androidx.media3.common.util.Assertions.checkNotEmpty;
 import static androidx.media3.common.util.Assertions.checkNotNull;
@@ -343,7 +344,7 @@ public class MediaController implements Player {
 
   /* package */ final Handler applicationHandler;
 
-  @VisibleForTesting long timeDiffMs;
+  private long timeDiffMs;
 
   private boolean connectionNotified;
 
@@ -1722,10 +1723,19 @@ public class MediaController implements Player {
   }
 
   /**
-   * Sets the time diff forcefully when calculating current position.
-   *
-   * @param timeDiffMs {@code C.TIME_UNSET} for reset.
+   * Gets the optional time diff (in milliseconds) used for calculating the current position, or
+   * {@link C#TIME_UNSET} if no diff should be applied.
    */
+  /* package */ long getTimeDiffMs() {
+    return timeDiffMs;
+  }
+
+  /**
+   * Sets the time diff (in milliseconds) used when calculating the current position.
+   *
+   * @param timeDiffMs {@link C#TIME_UNSET} for reset.
+   */
+  @VisibleForTesting(otherwise = NONE)
   /* package */ void setTimeDiffMs(long timeDiffMs) {
     verifyApplicationThread();
     this.timeDiffMs = timeDiffMs;
diff --git a/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplBase.java b/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplBase.java
index 0c269ba2ae..c3a8794fa3 100644
--- a/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplBase.java
+++ b/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplBase.java
@@ -644,8 +644,8 @@ import org.checkerframework.checker.nullness.qual.NonNull;
       return playerInfo.sessionPositionInfo.positionInfo.positionMs;
     }
     long elapsedTimeMs =
-        (instance.timeDiffMs != C.TIME_UNSET)
-            ? instance.timeDiffMs
+        (instance.getTimeDiffMs() != C.TIME_UNSET)
+            ? instance.getTimeDiffMs()
             : SystemClock.elapsedRealtime() - playerInfo.sessionPositionInfo.eventTimeMs;
     long estimatedPositionMs =
         playerInfo.sessionPositionInfo.positionInfo.positionMs
@@ -686,8 +686,8 @@ import org.checkerframework.checker.nullness.qual.NonNull;
       return playerInfo.sessionPositionInfo.positionInfo.contentPositionMs;
     }
     long elapsedTimeMs =
-        (instance.timeDiffMs != C.TIME_UNSET)
-            ? instance.timeDiffMs
+        (instance.getTimeDiffMs() != C.TIME_UNSET)
+            ? instance.getTimeDiffMs()
             : SystemClock.elapsedRealtime() - playerInfo.sessionPositionInfo.eventTimeMs;
     long estimatedPositionMs =
         playerInfo.sessionPositionInfo.positionInfo.contentPositionMs
diff --git a/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplLegacy.java b/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplLegacy.java
index 74159bc4d0..a88f438b28 100644
--- a/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplLegacy.java
+++ b/libraries/session/src/main/java/androidx/media3/session/MediaControllerImplLegacy.java
@@ -1305,14 +1305,14 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
             controllerCompat.getFlags(),
             controllerCompat.isSessionReady(),
             controllerCompat.getRatingType(),
-            instance.timeDiffMs);
+            instance.getTimeDiffMs());
     Pair<@NullableType Integer, @NullableType Integer> reasons =
         calculateDiscontinuityAndTransitionReason(
             legacyPlayerInfo,
             controllerInfo,
             newLegacyPlayerInfo,
             newControllerInfo,
-            instance.timeDiffMs);
+            instance.getTimeDiffMs());
     updateControllerInfo(
         notifyConnected,
         newLegacyPlayerInfo,