diff --git a/platform/util/src/com/intellij/util/io/PersistentEnumerator.java b/platform/util/src/com/intellij/util/io/PersistentEnumerator.java
index 1b98322993ee..7fb982bd152f 100644
--- a/platform/util/src/com/intellij/util/io/PersistentEnumerator.java
+++ b/platform/util/src/com/intellij/util/io/PersistentEnumerator.java
@@ -35,7 +35,7 @@ import java.util.List;
  * @author max
  * @author jeka
  */
-public class PersistentEnumerator<Data> implements Forceable {
+public class PersistentEnumerator<Data> implements Forceable, Closeable {
   private static final Logger LOG = Logger.getInstance("#com.intellij.util.io.PersistentEnumerator");
   protected static final int NULL_ID = 0;
   protected static final int DATA_OFFSET = 8;
diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java b/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java
index 39b104c7738a..e541585e25ee 100644
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java
@@ -651,7 +651,7 @@ public class MavenIndex {
       if (exceptions[0] != null) throw exceptions[0];
     }
 
-    private void safeClose(PersistentEnumerator enumerator, MavenIndexException[] exceptions) {
+    private void safeClose(Closeable enumerator, MavenIndexException[] exceptions) {
       try {
         if (enumerator != null) enumerator.close();
       }