diff --git a/src/test/java/net/openhft/chronicle/map/MarkTest.java b/src/test/java/net/openhft/chronicle/map/MarkTest.java
index 825f5025c..14e901e01 100644
--- a/src/test/java/net/openhft/chronicle/map/MarkTest.java
+++ b/src/test/java/net/openhft/chronicle/map/MarkTest.java
@@ -46,6 +46,8 @@ public class MarkTest {
     @Test(timeout = 25000)
     public void persistedTest() {
         final File db = Paths.get(System.getProperty("java.io.tmpdir"), "mark").toFile();
+        if (db.exists())
+            db.delete();
         try {
             test(new Function<ChronicleMapBuilder<Integer, Integer>,
                     ChronicleMap<Integer, Integer>>() {