src/java.base/share/classes/java/util/zip/ZStreamRef.java

@@ -29,11 +29,11 @@
  * A reference to the native zlib's z_stream structure.
  */
 
 class ZStreamRef {
 
-    private long address;
+    private volatile long address;
     ZStreamRef (long address) {
         this.address = address;
     }
 
     long address() {