diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 1269267c627..8260ea857c6 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -34,6 +34,9 @@ Release 2.7.4 - UNRELEASED
     HADOOP-12418. TestRPC.testRPCInterruptedSimple fails intermittently.
     (kihwal)
 
+    HADOOP-13579. Fix source-level compatibility after HADOOP-11252.
+    (Tsuyoshi Ozawa via aajisaka)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
index 42b99345bd6..5612f8d23f3 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
@@ -212,7 +212,8 @@ public class Client {
    * @param conf Configuration
    * @param pingInterval the ping interval
    */
-  static final void setPingInterval(Configuration conf, int pingInterval) {
+  public static final void setPingInterval(Configuration conf,
+      int pingInterval) {
     conf.setInt(CommonConfigurationKeys.IPC_PING_INTERVAL_KEY, pingInterval);
   }
 
@@ -223,7 +224,7 @@ public class Client {
    * @param conf Configuration
    * @return the ping interval
    */
-  static final int getPingInterval(Configuration conf) {
+  public static final int getPingInterval(Configuration conf) {
     return conf.getInt(CommonConfigurationKeys.IPC_PING_INTERVAL_KEY,
         CommonConfigurationKeys.IPC_PING_INTERVAL_DEFAULT);
   }