diff --git a/dataload/rdf2json/src/main/java/uk/ac/ebi/rdf2json/annotators/LabelAnnotator.java b/dataload/rdf2json/src/main/java/uk/ac/ebi/rdf2json/annotators/LabelAnnotator.java
index 68288dd1..f745ebdf 100644
--- a/dataload/rdf2json/src/main/java/uk/ac/ebi/rdf2json/annotators/LabelAnnotator.java
+++ b/dataload/rdf2json/src/main/java/uk/ac/ebi/rdf2json/annotators/LabelAnnotator.java
@@ -30,6 +30,7 @@ public static Set<String> getLabelProperties(OntologyGraph graph) {
         Object configLabelProperties = graph.config.get("label_property");
 
         if(configLabelProperties instanceof Collection<?>) {
+            labelProperties.clear();
             labelProperties.addAll((Collection<String>) configLabelProperties);
         }