diff --git a/api/current.txt b/api/current.txt
index 4b9340062179a..c5bc1cad96482 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -46844,7 +46844,6 @@ package android.telephony {
   }
 
   public static final class CarrierConfigManager.Apn {
-    field public static final String KEY_PREFIX = "apn.";
     field public static final String KEY_SETTINGS_DEFAULT_PROTOCOL_STRING = "apn.settings_default_protocol_string";
     field public static final String KEY_SETTINGS_DEFAULT_ROAMING_PROTOCOL_STRING = "apn.settings_default_roaming_protocol_string";
     field public static final String PROTOCOL_IPV4 = "IP";
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 6a40487f44ebf..b577550114fa7 100755
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1468,7 +1468,7 @@ public class CarrierConfigManager {
      */
     public static final class Apn {
         /** Prefix of all Apn.KEY_* constants. */
-        public static final String KEY_PREFIX = "apn.";
+        private static final String KEY_PREFIX = "apn.";
 
         /** IPv4 internet protocol */
         public static final String PROTOCOL_IPV4 = "IP";