diff --git a/ui/mirage/config.js b/ui/mirage/config.js
index 3978c9c5e..367dc67ba 100644
--- a/ui/mirage/config.js
+++ b/ui/mirage/config.js
@@ -234,7 +234,13 @@ export default function() {
         return new Response(200, {}, '[]');
       }
 
-      return this.serialize(csiVolumes.all());
+      const json = this.serialize(csiVolumes.all());
+      const namespace = queryParams.namespace || 'default';
+      return json.filter(volume =>
+        namespace === 'default'
+          ? !volume.NamespaceID || volume.NamespaceID === namespace
+          : volume.NamespaceID === namespace
+      );
     })
   );