diff --git a/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/ContentMapper.java b/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/ContentMapper.java
index 9c8d9f02f..68dc055d3 100644
--- a/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/ContentMapper.java
+++ b/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/ContentMapper.java
@@ -344,9 +344,6 @@ public MapperFacade getAutoMapper() {
      * @return ObjectMapper that has been configured to handle the segue recursive object model.
      */
     public ObjectMapper generateNewPreconfiguredContentMapper() {
-        ObjectMapper objectMapper = new ObjectMapper();
-        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
-
         ContentBaseDeserializer contentDeserializer = new ContentBaseDeserializer();
         contentDeserializer.registerTypeMap(jsonTypes);
 
@@ -368,9 +365,10 @@ public ObjectMapper generateNewPreconfiguredContentMapper() {
         contentDeserializerModule.addDeserializer(Choice.class, choiceDeserializer);
         contentDeserializerModule.addDeserializer(Item.class, itemDeserializer);
         contentDeserializerModule.addDeserializer(QuestionValidationResponse.class, validationResponseDeserializer);
-        contentDeserializerModule.addDeserializer(
-                LLMMarkingExpression.class, new LLMMarkingExpressionDeserializer(objectMapper));
+        contentDeserializerModule.addDeserializer(LLMMarkingExpression.class, new LLMMarkingExpressionDeserializer());
 
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
         objectMapper.registerModule(contentDeserializerModule);
         
         return objectMapper;
diff --git a/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/LLMMarkingExpressionDeserializer.java b/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/LLMMarkingExpressionDeserializer.java
index 47116926e..a689f90b8 100644
--- a/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/LLMMarkingExpressionDeserializer.java
+++ b/src/main/java/uk/ac/cam/cl/dtg/segue/dao/content/LLMMarkingExpressionDeserializer.java
@@ -14,15 +14,10 @@
 import java.io.IOException;
 
 public class LLMMarkingExpressionDeserializer extends JsonDeserializer<LLMMarkingExpression> {
-    private final ObjectMapper objectMapper;
-
-    public LLMMarkingExpressionDeserializer(ObjectMapper objectMapper) {
-        this.objectMapper = objectMapper;
-    }
-
     @Override
     public LLMMarkingExpression deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext)
             throws IOException {
+        ObjectMapper objectMapper = (ObjectMapper) jsonParser.getCodec();
         ObjectNode root = objectMapper.readTree(jsonParser);
 
         if (null == root.get("type")) {