diff --git a/openbis-common/source/java/ch/systemsx/cisd/openbis/common/api/server/json/deserializer/JsonTypeAndClassDeserializer.java b/openbis-common/source/java/ch/systemsx/cisd/openbis/common/api/server/json/deserializer/JsonTypeAndClassDeserializer.java
index c1b16022dcd20c6dd9b90185a3a3f9b5d66244c0..27059d1aaca16706087b1cd3749986ae52125df9 100644
--- a/openbis-common/source/java/ch/systemsx/cisd/openbis/common/api/server/json/deserializer/JsonTypeAndClassDeserializer.java
+++ b/openbis-common/source/java/ch/systemsx/cisd/openbis/common/api/server/json/deserializer/JsonTypeAndClassDeserializer.java
@@ -132,7 +132,7 @@ public class JsonTypeAndClassDeserializer extends AsPropertyTypeDeserializer
 
             if (tb == null)
             {
-                tb = new TokenBuffer(null);
+                tb = new TokenBuffer(null, false);
             }
 
             tb.writeFieldName(name);