diff --git a/code/ryzom/client/src/interface_v3/ctrl_text_button.cpp b/code/ryzom/client/src/interface_v3/ctrl_text_button.cpp
index d2191a4eb..1e8c7c07b 100644
--- a/code/ryzom/client/src/interface_v3/ctrl_text_button.cpp
+++ b/code/ryzom/client/src/interface_v3/ctrl_text_button.cpp
@@ -86,8 +86,7 @@ bool CCtrlTextButton::parse(xmlNodePtr cur, CInterfaceGroup * parentGroup)
 	prop = (char*) xmlGetProp( cur, (xmlChar*)"tx_normal" );
 	if (prop)
 	{
-		string TxName = (const char *) prop;
-		TxName = strlwr(TxName);
+		string TxName = toLower(std::string((const char *) prop));
 		_TextureIdNormal[0].setTexture((TxName+"_l.tga").c_str());
 		_TextureIdNormal[1].setTexture((TxName+"_m.tga").c_str());
 		_TextureIdNormal[2].setTexture((TxName+"_r.tga").c_str());
@@ -96,8 +95,7 @@ bool CCtrlTextButton::parse(xmlNodePtr cur, CInterfaceGroup * parentGroup)
 	prop = (char*) xmlGetProp( cur, (xmlChar*)"tx_pushed" );
 	if (prop)
 	{
-		string TxName = (const char *) prop;
-		TxName = strlwr(TxName);
+		string TxName = toLower(std::string((const char *) prop));
 		_TextureIdPushed[0].setTexture((TxName+"_l.tga").c_str());
 		_TextureIdPushed[1].setTexture((TxName+"_m.tga").c_str());
 		_TextureIdPushed[2].setTexture((TxName+"_r.tga").c_str());
@@ -106,8 +104,7 @@ bool CCtrlTextButton::parse(xmlNodePtr cur, CInterfaceGroup * parentGroup)
 	prop = (char*) xmlGetProp( cur, (xmlChar*)"tx_over" );
 	if (prop)
 	{
-		string TxName = (const char *) prop;
-		TxName = strlwr(TxName);
+		string TxName = toLower(std::string((const char *) prop));
 		_TextureIdOver[0].setTexture((TxName+"_l.tga").c_str());
 		_TextureIdOver[1].setTexture((TxName+"_m.tga").c_str());
 		_TextureIdOver[2].setTexture((TxName+"_r.tga").c_str());