diff --git a/lucene/core/src/java/org/apache/lucene/store/Directory.java b/lucene/core/src/java/org/apache/lucene/store/Directory.java
index 0efc3f939779..9bf531a97492 100644
--- a/lucene/core/src/java/org/apache/lucene/store/Directory.java
+++ b/lucene/core/src/java/org/apache/lucene/store/Directory.java
@@ -152,12 +152,12 @@ public abstract void close()
    * "scopes" to the right index.
    */
   public String getLockID() {
-      return this.toString();
+    return this.toString();
   }
 
   @Override
   public String toString() {
-    return super.toString() + " lockFactory=" + getLockFactory();
+    return getClass().getSimpleName() + '@' + Integer.toHexString(hashCode()) + " lockFactory=" + getLockFactory();
   }
 
   /**
diff --git a/lucene/core/src/java/org/apache/lucene/store/RAMDirectory.java b/lucene/core/src/java/org/apache/lucene/store/RAMDirectory.java
index 1730378430b8..9ae0d3639df2 100644
--- a/lucene/core/src/java/org/apache/lucene/store/RAMDirectory.java
+++ b/lucene/core/src/java/org/apache/lucene/store/RAMDirectory.java
@@ -102,6 +102,11 @@ private RAMDirectory(Directory dir, boolean closeDir, IOContext context) throws
     }
   }
 
+  @Override
+  public String getLockID() {
+    return "lucene-" + Integer.toHexString(hashCode());
+  }
+  
   @Override
   public final String[] listAll() {
     ensureOpen();
@@ -201,4 +206,5 @@ public void close() {
     isOpen = false;
     fileMap.clear();
   }
+  
 }