diff --git a/anon/src/index.ts b/anon/src/index.ts
index a29f11e..1bb54b1 100644
--- a/anon/src/index.ts
+++ b/anon/src/index.ts
@@ -200,6 +200,7 @@ function anonymize(
       return undefined;
     }
 
+    case '':
     case 't:':
     case ':':
     case 'c:':