diff --git a/code/nel/src/gui/ctrl_col_pick.cpp b/code/nel/src/gui/ctrl_col_pick.cpp
index 3b5145e20..3d248164d 100644
--- a/code/nel/src/gui/ctrl_col_pick.cpp
+++ b/code/nel/src/gui/ctrl_col_pick.cpp
@@ -205,12 +205,12 @@ namespace NLGUI
 		CViewRenderer &rVR = *CViewRenderer::getInstance();
 		if(prop)
 		{
-			string sTmp = NLMISC::strlwr((const char*)prop);
+			string sTmp = NLMISC::toLower((const char*)prop);
 			_Texture = rVR.createTexture (sTmp, 0, 0, 256, 64, false, false);
 		}
 
 		prop = (char*) xmlGetProp( node, (xmlChar*)"onchange" );
-		if (prop)	_AHOnChange = NLMISC::strlwr(prop);
+		if (prop)	_AHOnChange = NLMISC::toLower(prop);
 		prop = (char*) xmlGetProp( node, (xmlChar*)"onchange_params" );
 		if (prop)	_AHOnChangeParams = string((const char*)prop);
 
diff --git a/code/nel/src/gui/interface_element.cpp b/code/nel/src/gui/interface_element.cpp
index c7a0c234b..2907df471 100644
--- a/code/nel/src/gui/interface_element.cpp
+++ b/code/nel/src/gui/interface_element.cpp
@@ -993,8 +993,7 @@ namespace NLGUI
 	// ------------------------------------------------------------------------------------------------
 	bool			CInterfaceElement::convertBool (const char *ptr)
 	{
-		std::string str = ptr;
-		NLMISC::strlwr( str );
+		std::string str = toLower(ptr);
 		bool b = false;
 		fromString( str, b );
 		return b;
diff --git a/code/nel/src/gui/view_bitmap.cpp b/code/nel/src/gui/view_bitmap.cpp
index 01c2e8232..21c0c2cd4 100644
--- a/code/nel/src/gui/view_bitmap.cpp
+++ b/code/nel/src/gui/view_bitmap.cpp
@@ -307,8 +307,7 @@ namespace NLGUI
 		prop = (char*) xmlGetProp( cur, (xmlChar*)"texture" );
 		if (prop)
 		{
-			string TxName = (const char *) prop;
-			TxName = strlwr (TxName);
+			string TxName = toLower((const char *) prop);
 			setTexture (TxName);
 			//CInterfaceManager *pIM = CInterfaceManager::getInstance();
 			//CViewRenderer &rVR = *CViewRenderer::getInstance();
@@ -450,7 +449,6 @@ namespace NLGUI
 	// ----------------------------------------------------------------------------
 	void CViewBitmap::setTexture(const std::string & TxName)
 	{
-
 		_TextureId.setTexture (TxName.c_str (), _TxtOffsetX, _TxtOffsetY, _TxtWidth, _TxtHeight, false);
 	}
 
diff --git a/code/nel/src/gui/view_renderer.cpp b/code/nel/src/gui/view_renderer.cpp
index 6d3ef62e7..b2758c634 100644
--- a/code/nel/src/gui/view_renderer.cpp
+++ b/code/nel/src/gui/view_renderer.cpp
@@ -894,11 +894,11 @@ namespace NLGUI
 	{
 		if (sGlobalTextureName.empty()) return -1;
 		// Look if already existing
-		string sLwrGTName = strlwr(sGlobalTextureName);
+		string sLwrGTName = toLower(sGlobalTextureName);
 		TGlobalTextureList::iterator ite = _GlobalTextures.begin();
 		while (ite != _GlobalTextures.end())
 		{
-			std::string sText = strlwr(ite->Name);
+			std::string sText = toLower(ite->Name);
 			if (sText == sLwrGTName)
 				break;
 			ite++;
diff --git a/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp b/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp
index d48b82669..4d5901358 100644
--- a/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp
+++ b/code/ryzom/client/src/client_sheets/sbrick_sheet.cpp
@@ -312,8 +312,7 @@ void CSBrickSheet::build (const NLGEORGES::UFormElm &root)
 	BrickRequiredFlags= 0;
 	for(i=0;i<Properties.size();i++)
 	{
-		string text= Properties[i].Text;
-		strlwr(text);
+		string text= NLMISC::toLower(Properties[i].Text);
 
 		// If the property is an opening property
 		const	string	openingProp[]= { "opening_1:", "opening_2:", "opening_3:" };