diff --git a/data/entities.js b/data/entities.js
index f64b3bb..e5381d0 100644
--- a/data/entities.js
+++ b/data/entities.js
@@ -6450,7 +6450,7 @@ module.exports = [
   {
     name: 'Maxymiser',
     category: 'analytics',
-    domains: ['*.maxymiser.net, maxymiser.hs.llnwd.net'],
+    domains: ['*.maxymiser.net', 'maxymiser.hs.llnwd.net'],
   },
   {
     name: 'McAffee',
diff --git a/lib/entities.test.js b/lib/entities.test.js
index ca6339d..769fe95 100644
--- a/lib/entities.test.js
+++ b/lib/entities.test.js
@@ -24,4 +24,14 @@ describe('Entities', () => {
       }
     }
   })
+
+  it('should not have commas within a domain', () => {
+    for (const entity of entities) {
+      for (const domain of entity.domains) {
+        // A domain can be `*.maxymiser.net` or `maxymiser.hs.llnwd.net`
+        // A domain can't be `*.maxymiser.net, maxymiser.hs.llnwd.net`
+        expect(domain).toEqual(expect.not.stringContaining(','))
+      }
+    }
+  })
 })