diff --git a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmCassette.swift b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmCassette.swift
index 0ba20b56..10beedc2 100644
--- a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmCassette.swift
+++ b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmCassette.swift
@@ -165,6 +165,7 @@ extension vChewingLM {
       nameCJK.removeAll()
       selectionKeys.removeAll()
       endKeys.removeAll()
+      reverseLookupMap.removeAll()
       octagramMap.removeAll()
       octagramDividedMap.removeAll()
       wildcardKey.removeAll()