diff --git a/lucene/core/src/test/org/apache/lucene/index/TestDirectoryReaderReopen.java b/lucene/core/src/test/org/apache/lucene/index/TestDirectoryReaderReopen.java
index be231909921..d29a5493062 100644
--- a/lucene/core/src/test/org/apache/lucene/index/TestDirectoryReaderReopen.java
+++ b/lucene/core/src/test/org/apache/lucene/index/TestDirectoryReaderReopen.java
@@ -626,7 +626,7 @@ public class TestDirectoryReaderReopen extends LuceneTestCase {
     MockDirectoryWrapper dir = newMockDirectory();
     if (dir instanceof MockDirectoryWrapper) {
       // ensure we produce enough of our exceptions
-      ((MockDirectoryWrapper)dir).setEnableVirusScanner(false);
+      dir.setEnableVirusScanner(false);
     }
 
     IndexWriterConfig iwc = new IndexWriterConfig(new MockAnalyzer(random()));