diff --git a/Source/Modules/IMEModules/mgrPrefs.swift b/Source/Modules/IMEModules/mgrPrefs.swift
index 354ac3d3..f48a5ce7 100644
--- a/Source/Modules/IMEModules/mgrPrefs.swift
+++ b/Source/Modules/IMEModules/mgrPrefs.swift
@@ -138,7 +138,7 @@ struct CandidateListTextSize {
 
 // MARK: -
 
-enum MandarinParser: Int {
+enum MandarinParser: Int, CaseIterable {
   case ofStandard = 0
   case ofETen = 1
   case ofHsu = 2