diff --git a/core/src/main/java/org/pivxj/store/WindowsMMapHack.java b/core/src/main/java/org/pivxj/store/WindowsMMapHack.java
index 7b1758bc1..b947d5b42 100644
--- a/core/src/main/java/org/pivxj/store/WindowsMMapHack.java
+++ b/core/src/main/java/org/pivxj/store/WindowsMMapHack.java
@@ -14,6 +14,7 @@
 
 package org.pivxj.store;
 
+import jdk.internal.ref.Cleaner;
 import sun.misc.*;
 import sun.nio.ch.*;