diff --git a/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.js b/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.js
index edc1790b3adac..7b979d74a329c 100644
--- a/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.js
+++ b/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.js
@@ -279,7 +279,7 @@ export class AnomalyDetails extends Component {
           ),
         },
         {
-          id: 'Category examples',
+          id: 'category-examples',
           name: i18n.translate('xpack.ml.anomaliesTable.anomalyDetails.categoryExamplesTitle', {
             defaultMessage: 'Category examples',
           }),
diff --git a/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.test.js b/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.test.js
index 9fd1ffc3b637f..78c036eac1903 100644
--- a/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.test.js
+++ b/x-pack/plugins/ml/public/application/components/anomalies_table/anomaly_details.test.js
@@ -67,7 +67,7 @@ describe('AnomalyDetails', () => {
       tabIndex: 1,
     };
     const wrapper = shallowWithIntl(<AnomalyDetails {...categoryTabProps} />);
-    expect(wrapper.prop('initialSelectedTab').id).toBe('Category examples');
+    expect(wrapper.prop('initialSelectedTab').id).toBe('category-examples');
   });
 
   test('Renders with terms and regex when definition prop is not undefined', () => {