diff --git a/nel/src/gui/css_background_renderer.cpp b/nel/src/gui/css_background_renderer.cpp
index 4d7df021e..2c755ad80 100644
--- a/nel/src/gui/css_background_renderer.cpp
+++ b/nel/src/gui/css_background_renderer.cpp
@@ -438,7 +438,7 @@ namespace NLGUI
 
 		if (bg.repeatX == CSS_VALUE_ROUND)
 		{
-			sint numTiles = std::max(1, (sint)std::round((float)areaW / texW));
+			sint numTiles = std::max(1, (sint)std::ceil(((float)areaW / texW) - 0.5f));
 			texW = areaW / numTiles;
 			if (bg.height.isAuto() && bg.repeatY != CSS_VALUE_ROUND)
 			{
@@ -449,7 +449,7 @@ namespace NLGUI
 
 		if (bg.repeatY == CSS_VALUE_ROUND)
 		{
-			sint numTiles = std::max(1, (sint)std::round((float)areaH / texH));
+			sint numTiles = std::max(1, (sint)std::ceil(((float)areaH / texH) - 0.5f));
 			texH = areaH / numTiles;
 			if (bg.width.isAuto() && bg.repeatX != CSS_VALUE_ROUND)
 			{
diff --git a/nel/src/gui/css_length.cpp b/nel/src/gui/css_length.cpp
index 79465c27d..b68b90f25 100644
--- a/nel/src/gui/css_length.cpp
+++ b/nel/src/gui/css_length.cpp
@@ -30,9 +30,10 @@ namespace NLGUI
 
 bool CSSLength::parseValue(const std::string &value, bool allowPercent, bool allowNegative)
 {
-	static const std::set<std::string> knownUnits = {
+	static const std::string knownUnitsArr[] = {
 		"%", "rem", "em", "px", "pt", "vw", "vh", "vi", "vb", "vmin", "vmax"
 	};
+	static const std::set<std::string> knownUnits(knownUnitsArr, &knownUnitsArr[sizeof(knownUnitsArr) / sizeof(knownUnitsArr[0])]);
 
 	std::string::size_type pos = 0;
 	std::string::size_type len = value.size();
diff --git a/nel/src/gui/libwww.cpp b/nel/src/gui/libwww.cpp
index 5d739863d..69d0ca992 100644
--- a/nel/src/gui/libwww.cpp
+++ b/nel/src/gui/libwww.cpp
@@ -208,9 +208,10 @@ namespace NLGUI
 	// ***************************************************************************
 	bool getCssLength (float &value, std::string &unit, const std::string &str, bool neg)
 	{
-		static const std::set<std::string> knownUnits = {
+		static const std::string knownUnitsArr[] = {
 			"%", "rem", "em", "px", "pt", "vw", "vh", "vi", "vb", "vmin", "vmax"
 		};
+		static const std::set<std::string> knownUnits(knownUnitsArr, &knownUnitsArr[sizeof(knownUnitsArr) / sizeof(knownUnitsArr[0])]);
 
 		std::string::size_type pos = 0;
 		std::string::size_type len = str.size();