diff --git a/registry-persistence/src/main/java/org/gbif/registry/persistence/mapper/handler/CountryNotNullTypeHandler.java b/registry-persistence/src/main/java/org/gbif/registry/persistence/mapper/handler/CountryNotNullTypeHandler.java
index 66b648e7b..e1cde0eca 100644
--- a/registry-persistence/src/main/java/org/gbif/registry/persistence/mapper/handler/CountryNotNullTypeHandler.java
+++ b/registry-persistence/src/main/java/org/gbif/registry/persistence/mapper/handler/CountryNotNullTypeHandler.java
@@ -12,10 +12,12 @@ public CountryNotNullTypeHandler() {
   public static class CountryNotNullConverter implements EnumConverter<String, Country> {
     public CountryNotNullConverter() {}
 
+    @Override
     public String fromEnum(Country value) {
       return value != null ? value.getIso2LetterCode() : null;
     }
 
+    @Override
     public Country toEnum(String key) {
       if (key == null) {
         return null;