diff --git a/core/src/test/java/org/elasticsearch/search/SearchRequestTests.java b/core/src/test/java/org/elasticsearch/search/SearchRequestTests.java
index 5861dd5eb13..3db3492f415 100644
--- a/core/src/test/java/org/elasticsearch/search/SearchRequestTests.java
+++ b/core/src/test/java/org/elasticsearch/search/SearchRequestTests.java
@@ -30,6 +30,7 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.indices.IndicesModule;
 import org.elasticsearch.test.ESTestCase;
+import org.junit.AfterClass;
 import org.junit.BeforeClass;
 
 import java.io.IOException;
@@ -64,6 +65,11 @@ public class SearchRequestTests extends ESTestCase {
         namedWriteableRegistry = new NamedWriteableRegistry(entries);
     }
 
+    @AfterClass
+    public static void afterClass() {
+        namedWriteableRegistry = null;
+    }
+
     public void testSerialization() throws Exception {
         SearchRequest searchRequest = createSearchRequest();
         try (BytesStreamOutput output = new BytesStreamOutput()) {