diff --git a/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java b/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java
index ce6b74bb2..7f085d7a2 100755
--- a/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java
+++ b/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java
@@ -1406,8 +1406,8 @@ public class ChronicleMapTest {
     }
 
 
-    @Ignore
-    @Test(expected = NullPointerException.class)
+
+    @Test(expected = IllegalStateException.class)
     public void testPutLongValue() throws IOException {
         final ChronicleMapBuilder<CharSequence, LongValue> builder = ChronicleMapBuilder
                 .of(CharSequence.class, LongValue.class)