diff --git a/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.h b/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.h
index 661cfe15..178ee21a 100644
--- a/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.h
+++ b/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.h
@@ -45,8 +45,8 @@ public:
     void close();
     void dump();
 
-    virtual const vector<Bigram> bigramsForKeys(const string& preceedingKey, const string& key);
-    virtual const vector<Unigram> unigramsForKey(const string& key);
+    virtual const std::vector<Taiyan::Gramambular::Bigram> bigramsForKeys(const string& preceedingKey, const string& key);
+    virtual const std::vector<Taiyan::Gramambular::Unigram> unigramsForKey(const string& key);
     virtual bool hasUnigramsForKey(const string& key);
 
 protected:
diff --git a/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.mm b/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.mm
index 14d6cd63..683106ce 100644
--- a/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.mm
+++ b/Source/Modules/LangModelRelated/SubLanguageModels/CoreLM.mm
@@ -281,14 +281,14 @@ void vChewing::CoreLM::dump()
     }
 }
 
-const vector<Bigram> vChewing::CoreLM::bigramsForKeys(const string& preceedingKey, const string& key)
+const std::vector<Taiyan::Gramambular::Bigram> vChewing::CoreLM::bigramsForKeys(const string& preceedingKey, const string& key)
 {
-    return vector<Bigram>();
+    return std::vector<Taiyan::Gramambular::Bigram>();
 }
 
-const vector<Unigram> vChewing::CoreLM::unigramsForKey(const string& key)
+const std::vector<Taiyan::Gramambular::Unigram> vChewing::CoreLM::unigramsForKey(const string& key)
 {
-    vector<Unigram> v;
+    std::vector<Taiyan::Gramambular::Unigram> v;
     map<const char *, vector<Row> >::const_iterator i = keyRowMap.find(key.c_str());
 
     if (i != keyRowMap.end()) {