diff --git a/dao/src/main/java/life/catalogue/es/EsNameUsage.java b/dao/src/main/java/life/catalogue/es/EsNameUsage.java
index 4755a90fa2..508d286cab 100644
--- a/dao/src/main/java/life/catalogue/es/EsNameUsage.java
+++ b/dao/src/main/java/life/catalogue/es/EsNameUsage.java
@@ -50,7 +50,7 @@ public class EsNameUsage {
   private TaxonomicStatus status;
   private Set<Issue> issues;
   private Set<Environment> environments;
-  @Analyzers(STANDARD_ASCII)
+  @Analyzers(KEYWORD)
   private List<String> classificationIds;
   private Boolean extinct;
 
diff --git a/dao/src/test/java/life/catalogue/es/nu/search/NameUsageSearchParameterTest.java b/dao/src/test/java/life/catalogue/es/nu/search/NameUsageSearchParameterTest.java
index 89e86a3342..570562c9dc 100644
--- a/dao/src/test/java/life/catalogue/es/nu/search/NameUsageSearchParameterTest.java
+++ b/dao/src/test/java/life/catalogue/es/nu/search/NameUsageSearchParameterTest.java
@@ -74,6 +74,11 @@ public void testTaxonId1() {
     List<NameUsageWrapper> expected = Arrays.asList(nuw1, nuw2, nuw3);
     assertEquals(expected, search(query).getResult());
 
+    query = new NameUsageSearchRequest();
+    query.addFilter(TAXON_ID, "4");
+    expected = Arrays.asList(nuw2, nuw3, nuw4);
+    assertEquals(expected, search(query).getResult());
+
     countdown(TAXON_ID);
   }