diff --git a/Source/Modules/LangModelRelated/mgrLangModel.h b/Source/Modules/LangModelRelated/mgrLangModel.h
index e003fd70..34c3dc48 100644
--- a/Source/Modules/LangModelRelated/mgrLangModel.h
+++ b/Source/Modules/LangModelRelated/mgrLangModel.h
@@ -36,6 +36,8 @@ NS_ASSUME_NONNULL_BEGIN
 + (BOOL)writeUserPhrase:(NSString *)userPhrase inputMode:(InputMode)mode areWeDuplicating:(BOOL)areWeDuplicating;
 + (void)setPhraseReplacementEnabled:(BOOL)phraseReplacementEnabled;
 + (void)setCNSEnabled:(BOOL)cnsEnabled;
++ (void)setSymbolEnabled:(BOOL)symbolEnabled;
+
 + (NSString *)specifyBundleDataPath:(NSString *)filename;
 + (NSString *)userPhrasesDataPath:(InputMode)mode;
 + (NSString *)userAssociatedPhrasesDataPath:(InputMode)mode;
diff --git a/Source/Modules/LangModelRelated/mgrLangModel.mm b/Source/Modules/LangModelRelated/mgrLangModel.mm
index 9c696d6c..6e211979 100644
--- a/Source/Modules/LangModelRelated/mgrLangModel.mm
+++ b/Source/Modules/LangModelRelated/mgrLangModel.mm
@@ -371,4 +371,10 @@ static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, vChewing
     gLangModelCHS.setCNSEnabled(cnsEnabled);
 }
 
++ (void)setSymbolEnabled:(BOOL)symbolEnabled
+{
+    gLangModelCHT.setSymbolEnabled(symbolEnabled);
+    gLangModelCHS.setSymbolEnabled(symbolEnabled);
+}
+
 @end