diff --git a/pom.xml b/pom.xml
index f1c471919..0b70d144a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -46,7 +46,7 @@
             <dependency>
                 <groupId>net.openhft</groupId>
                 <artifactId>lang</artifactId>
-                <version>6.4.12</version>
+                <version>6.4.13-SNAPSHOT</version>
             </dependency>
 
             <dependency>
diff --git a/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java b/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java
index 9aac4a616..6c7337300 100644
--- a/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java
+++ b/src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java
@@ -1389,12 +1389,13 @@ public class ChronicleMapTest {
     }
 
 
-    @Test(expected = IllegalStateException.class)
+    @Test(expected = IllegalArgumentException.class)
     public void testAcquireUsingLockedWithString() throws IOException {
 
         ChronicleMapBuilder<CharSequence, String> builder = ChronicleMapBuilder
                 .of(CharSequence.class, String.class)
                 .entries(1000)
+                .defaultValue("")
                 .entrySize(16);