diff --git a/src/EterBase/Stl.cpp b/src/EterBase/Stl.cpp
index 14cfad5..789ccd3 100644
--- a/src/EterBase/Stl.cpp
+++ b/src/EterBase/Stl.cpp
@@ -3,13 +3,12 @@
 
 static std::list<std::string> s_stList;
 
-char korean_tolower(const char c)
+char ascii_tolower(const char c)
 {
 	char ret = c;
 	if (c >= 'A' && c <= 'Z')
 		ret = c - 'A' + 'a';
 
-	assert(ret == tolower(c));
 	return ret;
 }
 
@@ -25,7 +24,7 @@ std::string& stl_static_string(const char * c_sz)
 void stl_lowers(std::string& rstRet)
 {
 	for (size_t i = 0; i < rstRet.length(); ++i)
-		rstRet[i] = korean_tolower(rstRet[i]);
+		rstRet[i] = ascii_tolower(rstRet[i]);
 }
 
 int split_string(const std::string& input, const std::string& delimiter, std::vector<std::string>& results, bool includeEmpties)
diff --git a/src/EterBase/Stl.h b/src/EterBase/Stl.h
index bc74865..48d844e 100644
--- a/src/EterBase/Stl.h
+++ b/src/EterBase/Stl.h
@@ -24,7 +24,7 @@
 
 #pragma warning ( pop )
 
-extern char korean_tolower(const char c);
+extern char ascii_tolower(const char c);
 extern std::string& stl_static_string(const char* c_sz);
 extern void stl_lowers(std::string& rstRet);
 extern int split_string(const std::string & input, const std::string & delimiter, std::vector<std::string>& results, bool includeEmpties);
diff --git a/src/EterBase/Utils.cpp b/src/EterBase/Utils.cpp
index bd185f5..c4cf54e 100644
--- a/src/EterBase/Utils.cpp
+++ b/src/EterBase/Utils.cpp
@@ -10,7 +10,7 @@
 #include "Utils.h"
 #include "filedir.h"
 
-char korean_tolower(const char c);
+char ascii_tolower(const char c);
 
 const char* CreateTempFileName(const char* c_pszPrefix)
 {
@@ -293,7 +293,7 @@ void StringLowers(char * String)
 {
 	for (DWORD i = 0; i < strlen(String); ++i)
 	{
-		String[i] = korean_tolower(String[i]);
+		String[i] = ascii_tolower(String[i]);
 	}
 }
 
@@ -304,7 +304,7 @@ void StringPath(std::string & rString)
 		if (rString[i] == '\\')
 			rString[i] = '/';
 		else
-			rString[i] = korean_tolower(rString[i]);
+			rString[i] = ascii_tolower(rString[i]);
 	}
 }
 
@@ -315,7 +315,7 @@ void StringPath(char * pString)
 		if (pString[i] == '\\')
 			pString[i] = '/';
 		else
-			pString[i] = korean_tolower(pString[i]);
+			pString[i] = ascii_tolower(pString[i]);
 	}
 }
 
@@ -326,7 +326,7 @@ void StringPath(const char * c_szSrc, char * szDest)
 		if (c_szSrc[i] == '\\')
 			szDest[i] = '/';
 		else
-			szDest[i] = korean_tolower(c_szSrc[i]);
+			szDest[i] = ascii_tolower(c_szSrc[i]);
 	}
 }
 
@@ -340,7 +340,7 @@ void StringPath(const char * c_szSrc, std::string & rString)
 		if (c_szSrc[i] == '\\')
 			rString[i] = '/';
 		else
-			rString[i] = korean_tolower(c_szSrc[i]);
+			rString[i] = ascii_tolower(c_szSrc[i]);
 	}
 }
 
diff --git a/src/EterLib/Resource.cpp b/src/EterLib/Resource.cpp
index d21c0b0..915e319 100644
--- a/src/EterLib/Resource.cpp
+++ b/src/EterLib/Resource.cpp
@@ -120,7 +120,7 @@ int CResource::ConvertPathName(const char * c_szPathName, char * pszRetPathName,
 		if (*pc == '/')
 			*(pszRetPathName++) = '\\';
 		else
-			*(pszRetPathName++) = (char) korean_tolower(*pc);
+			*(pszRetPathName++) = (char) ascii_tolower(*pc);
 	}
 
 	*pszRetPathName = '\0';
diff --git a/src/EterLib/ResourceManager.cpp b/src/EterLib/ResourceManager.cpp
index 777a831..4dd4df2 100644
--- a/src/EterLib/ResourceManager.cpp
+++ b/src/EterLib/ResourceManager.cpp
@@ -236,7 +236,7 @@ int __ConvertPathName(const char * c_szPathName, char * pszRetPathName, int retL
 		if (*pc == '/')
 			*(pszRetPathName++) = '\\';
 		else
-			*(pszRetPathName++) = (char) korean_tolower(*pc);
+			*(pszRetPathName++) = (char) ascii_tolower(*pc);
 	}
 
 	*pszRetPathName = '\0';
@@ -374,7 +374,7 @@ DWORD CResourceManager::__GetFileCRC(const char * c_szFileName, const char ** c_
 		if (src[len]=='/')
 			dst[len] = '\\';
 		else
-			dst[len] = (char) korean_tolower(src[len]);
+			dst[len] = (char) ascii_tolower(src[len]);
 
 		++len;
 	}