diff --git a/api/current.txt b/api/current.txt
index 83ba79d51c9ca..433f2edcb555f 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -38180,9 +38180,6 @@ package android.telecom {
     field public static final int RTT_MODE_VCO = 3; // 0x3
   }
 
-  public static abstract class Call.RttCall.RttAudioMode implements java.lang.annotation.Annotation {
-  }
-
   public final class CallAudioState implements android.os.Parcelable {
     ctor public CallAudioState(boolean, int, int);
     method public static java.lang.String audioRouteToString(int);
diff --git a/api/system-current.txt b/api/system-current.txt
index 0e269820e2538..3165aac2b197b 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -41230,9 +41230,6 @@ package android.telecom {
     field public static final int RTT_MODE_VCO = 3; // 0x3
   }
 
-  public static abstract class Call.RttCall.RttAudioMode implements java.lang.annotation.Annotation {
-  }
-
   public final class CallAudioState implements android.os.Parcelable {
     ctor public CallAudioState(boolean, int, int);
     method public static java.lang.String audioRouteToString(int);
diff --git a/api/test-current.txt b/api/test-current.txt
index cc99875ee3d0e..5fc7af66ecdbb 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -38364,9 +38364,6 @@ package android.telecom {
     field public static final int RTT_MODE_VCO = 3; // 0x3
   }
 
-  public static abstract class Call.RttCall.RttAudioMode implements java.lang.annotation.Annotation {
-  }
-
   public final class CallAudioState implements android.os.Parcelable {
     ctor public CallAudioState(boolean, int, int);
     method public static java.lang.String audioRouteToString(int);
diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index 4295d401edd43..3f7c908436a48 100644
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -878,6 +878,7 @@ public final class Call {
      * party, if it is active.
      */
     public static final class RttCall {
+        /** @hide */
         @Retention(RetentionPolicy.SOURCE)
         @IntDef({RTT_MODE_INVALID, RTT_MODE_FULL, RTT_MODE_HCO, RTT_MODE_VCO})
         public @interface RttAudioMode {}