diff --git a/java/com/android/dialer/simulator/impl/RttChatBot.java b/java/com/android/dialer/simulator/impl/RttChatBot.java
index 9c2989a..5a7769f 100644
--- a/java/com/android/dialer/simulator/impl/RttChatBot.java
+++ b/java/com/android/dialer/simulator/impl/RttChatBot.java
@@ -16,6 +16,7 @@
 
 package com.android.dialer.simulator.impl;
 
+import android.annotation.TargetApi;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
@@ -30,6 +31,7 @@
 import java.util.Random;
 
 /** Chat bot to generate remote RTT chat messages. */
+@TargetApi(28)
 public class RttChatBot {
 
   interface Callback {
diff --git a/java/com/android/incallui/call/DialerCall.java b/java/com/android/incallui/call/DialerCall.java
index cbe7c57..3788061 100644
--- a/java/com/android/incallui/call/DialerCall.java
+++ b/java/com/android/incallui/call/DialerCall.java
@@ -17,6 +17,7 @@
 package com.android.incallui.call;
 
 import android.Manifest.permission;
+import android.annotation.TargetApi;
 import android.content.Context;
 import android.hardware.camera2.CameraCharacteristics;
 import android.net.Uri;
@@ -929,6 +930,7 @@
     return getVideoTech().isTransmittingOrReceiving() || VideoProfile.isVideo(getVideoState());
   }
 
+  @TargetApi(28)
   public boolean isRttCall() {
     if (BuildCompat.isAtLeastP()) {
       return getTelecomCall().isRttActive();