diff --git a/src/main/java/org/apache/hadoop/hbase/ipc/HBaseRPCProtocolVersion.java b/src/main/java/org/apache/hadoop/hbase/ipc/HBaseRPCProtocolVersion.java
index 866bb30a0a7..90aefe7d632 100644
--- a/src/main/java/org/apache/hadoop/hbase/ipc/HBaseRPCProtocolVersion.java
+++ b/src/main/java/org/apache/hadoop/hbase/ipc/HBaseRPCProtocolVersion.java
@@ -78,7 +78,10 @@ public interface HBaseRPCProtocolVersion extends VersionedProtocol {
    * <li>Version 24: HBASE-2473, create table with regions.</li>
    * <li>Version 25: Added openRegion and Stoppable/Abortable to API.</li>
    * <li>Version 26: New master.</li>
+   * REVERTED TO 25 TEMPORARILY -- TESTTABLEMAPREDUCE IS FAILING WITH
+   * HBaseRPC$VersionMismatch: Protocol org.apache.hadoop.hbase.ipc.HRegionInterface version mismatch. (client = 26, server = 25)
+   * ON HUDSON.
    * </ul>
    */
-  public static final long versionID = 26L;
+  public static final long versionID = 25L;
 }