diff --git a/library/core/src/main/java/com/google/android/exoplayer2/drm/DrmSession.java b/library/core/src/main/java/com/google/android/exoplayer2/drm/DrmSession.java
index cb0143db2c..0c17b102fd 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/drm/DrmSession.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/drm/DrmSession.java
@@ -42,7 +42,7 @@ public interface DrmSession<T extends ExoMediaCrypto> {
    */
   @Retention(RetentionPolicy.SOURCE)
   @IntDef({STATE_RELEASED, STATE_ERROR, STATE_OPENING, STATE_OPENED, STATE_OPENED_WITH_KEYS})
-  @interface State {}
+  public @interface State {}
   /**
    * The session has been released.
    */