diff --git a/ZCppMain/ZtCStringEx.H b/ZCppMain/ZtCStringEx.H
index e7cc721..80776d9 100644
--- a/ZCppMain/ZtCStringEx.H
+++ b/ZCppMain/ZtCStringEx.H
@@ -307,7 +307,7 @@ namespace ZNsMain
         typedef TTypeString   ZCTypeString;
         typedef ZtCStringBase ZCStringBase;
     public:
-        typedef ZtCStringBase TypeBase    ;
+        typedef ZtCStringBase TypeThis    ;
     public:
         typedef typename ZCTypeString::ZCSearchInfo     ZCSearchInfo     ;
         typedef typename ZCTypeString::ZCSearchInfoList ZCSearchInfoList ;
@@ -1421,7 +1421,7 @@ namespace ZNsMain
 
         bool IsEqual(TypeCharC* APC_Data, TypeLength AL_Length) const
         {
-            return TypeBase::Minus(data(), APC_Data, size(), AL_Length)==0;
+            return TypeThis::Minus(data(), APC_Data, size(), AL_Length)==0;
         }/*
         bool IsEqual(TypeCharC* APC_Data, TypeLength AL_Length) const*/