diff --git a/pom.xml b/pom.xml
index dda3fd9..20e08d8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -137,6 +137,12 @@
 			<artifactId>commons-pool2</artifactId>
 		</dependency>
 		
+		<dependency>
+			<groupId>com.google.guava</groupId>
+			<artifactId>guava</artifactId>
+			<version>33.2.0-jre</version>
+		</dependency>
+		
 		<!-- XML -->
 		<dependency>
 			<groupId>org.dom4j</groupId>
@@ -159,6 +165,10 @@
 	                <groupId>io.swagger.core.v3</groupId>
 	                <artifactId>swagger-annotations</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>com.google.guava</groupId>
+					<artifactId>guava</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
 		
diff --git a/src/main/java/eu/dnetlib/app/directindex/mapping/InstanceWithTypeCode.java b/src/main/java/eu/dnetlib/app/directindex/mapping/InstanceWithTypeCode.java
index c6ccadb..c9ae1cb 100644
--- a/src/main/java/eu/dnetlib/app/directindex/mapping/InstanceWithTypeCode.java
+++ b/src/main/java/eu/dnetlib/app/directindex/mapping/InstanceWithTypeCode.java
@@ -1,5 +1,7 @@
 package eu.dnetlib.app.directindex.mapping;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
 import eu.dnetlib.dhp.schema.solr.Instance;
 
 // TODO: To delete after the dismission of the XML
@@ -7,6 +9,7 @@ public class InstanceWithTypeCode extends Instance {
 
 	private static final long serialVersionUID = -5415824868827493090L;
 
+	@JsonIgnore
 	private String instancetypeCode;
 
 	public String getInstancetypeCode() {