diff --git a/src/test/java/org/apache/hadoop/hbase/util/TestMergeTable.java b/src/test/java/org/apache/hadoop/hbase/util/TestMergeTable.java
index d1f74d695a6..5a9e89fdf93 100644
--- a/src/test/java/org/apache/hadoop/hbase/util/TestMergeTable.java
+++ b/src/test/java/org/apache/hadoop/hbase/util/TestMergeTable.java
@@ -118,7 +118,9 @@ public class TestMergeTable {
         MetaReader.getTableRegions(ct, desc.getName());
       LOG.info("postMergeTableRegions size=" + postMergeTableRegions.size() +
         "; " + postMergeTableRegions);
-      assertTrue(postMergeTableRegions.size() < originalTableRegions.size());
+      assertTrue("originalTableRegions=" + originalTableRegions.size() +
+        ", postMergeTableRegions=" + postMergeTableRegions.size(),
+        postMergeTableRegions.size() < originalTableRegions.size());
     } finally {
       UTIL.shutdownMiniCluster();
     }