diff --git a/api/current.txt b/api/current.txt
index 882b728897aea..976033169909b 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -46849,7 +46849,6 @@ 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 c72df9f776ab1..b90b3ff59ef03 100755
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1496,7 +1496,7 @@ 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";