diff --git a/lucene/src/test/org/apache/lucene/index/TestDeletionPolicy.java b/lucene/src/test/org/apache/lucene/index/TestDeletionPolicy.java
index cfe6ecb423f..98cb5b50e96 100644
--- a/lucene/src/test/org/apache/lucene/index/TestDeletionPolicy.java
+++ b/lucene/src/test/org/apache/lucene/index/TestDeletionPolicy.java
@@ -619,7 +619,7 @@ public class TestDeletionPolicy extends LuceneTestCase {
       Directory dir = newDirectory();
       IndexWriterConfig conf = newIndexWriterConfig(
           TEST_VERSION_CURRENT, new MockAnalyzer())
-          .setOpenMode(OpenMode.CREATE).setIndexDeletionPolicy(policy);
+        .setOpenMode(OpenMode.CREATE).setIndexDeletionPolicy(policy).setMergePolicy(newInOrderLogMergePolicy());
       MergePolicy mp = conf.getMergePolicy();
       if (mp instanceof LogMergePolicy) {
         ((LogMergePolicy) mp).setUseCompoundFile(useCompoundFile);