diff --git a/String.cpp b/String.cpp
index c0b49368..da9c67e3 100644
--- a/String.cpp
+++ b/String.cpp
@@ -172,7 +172,10 @@ inline unsigned char* CString::strnchr(const unsigned char* src, unsigned char c
     return NULL;
 }
 
-int CString::CaseCmp(const CString& s) const {
+int CString::CaseCmp(const CString& s, u_long uLen ) const {
+	if( uLen != CString::npos ) {
+		return strncasecmp(c_str(), s.c_str(), uLen);
+	}
 	return strcasecmp(c_str(), s.c_str());
 }
 
diff --git a/String.h b/String.h
index 9cbad147..2ed4b928 100644
--- a/String.h
+++ b/String.h
@@ -79,7 +79,7 @@ public:
 	virtual ~CString() {}
 
 	inline unsigned char* strnchr(const unsigned char* src, unsigned char c, unsigned int iMaxBytes, unsigned char* pFill = NULL, unsigned int* piCount = NULL) const;
-	int CaseCmp(const CString& s) const;
+	int CaseCmp(const CString& s, u_long uLen = CString::npos ) const;
 	int StrCmp(const CString& s) const;
 	static bool WildCmp(const CString& sWild, const CString& sString);
 	bool WildCmp(const CString& sWild) const;