diff --git a/src/test/org/apache/lucene/index/TestNorms.java b/src/test/org/apache/lucene/index/TestNorms.java
index 1a61f012e60..17d789117f1 100755
--- a/src/test/org/apache/lucene/index/TestNorms.java
+++ b/src/test/org/apache/lucene/index/TestNorms.java
@@ -28,7 +28,7 @@ import org.apache.lucene.document.Field.Store;
 import org.apache.lucene.search.DefaultSimilarity;
 import org.apache.lucene.search.Similarity;
 import org.apache.lucene.store.Directory;
-import org.apache.lucene.store.FSDirectory;
+import org.apache.lucene.store.RAMDirectory;
 
 import java.io.File;
 import java.io.IOException;
@@ -75,15 +75,7 @@ public class TestNorms extends LuceneTestCase {
    * Including optimize. 
    */
   public void testNorms() throws IOException {
-    // tmp dir
-    String tempDir = System.getProperty("java.io.tmpdir");
-    if (tempDir == null) {
-      throw new IOException("java.io.tmpdir undefined, cannot run test");
-    }
-    
-    // test with a single index: index1
-    File indexDir1 = new File(tempDir, "lucenetestindex1");
-    Directory dir1 = FSDirectory.open(indexDir1);
+    Directory dir1 = new RAMDirectory();
 
     norms = new ArrayList<Float>();
     modifiedNorms = new ArrayList<Float>();
@@ -100,15 +92,13 @@ public class TestNorms extends LuceneTestCase {
     modifiedNorms = new ArrayList<Float>();
     numDocNorms = 0;
     
-    File indexDir2 = new File(tempDir, "lucenetestindex2");
-    Directory dir2 = FSDirectory.open(indexDir2);
+    Directory dir2 = new RAMDirectory();
 
     createIndex(dir2);
     doTestNorms(dir2);
 
     // add index1 and index2 to a third index: index3
-    File indexDir3 = new File(tempDir, "lucenetestindex3");
-    Directory dir3 = FSDirectory.open(indexDir3);
+    Directory dir3 = new RAMDirectory();
 
     createIndex(dir3);
     IndexWriter iw = new IndexWriter(dir3,anlzr,false, IndexWriter.MaxFieldLength.LIMITED);