diff --git a/cocos/2d/CCLabel.cpp b/cocos/2d/CCLabel.cpp
index f343284854..b501d4ff0a 100644
--- a/cocos/2d/CCLabel.cpp
+++ b/cocos/2d/CCLabel.cpp
@@ -2391,7 +2391,7 @@ FontDefinition Label::_getFontDefinition() const
     systemFontDef._fontSize = _systemFontSize;
     systemFontDef._alignment = _hAlignment;
     systemFontDef._vertAlignment = _vAlignment;
-    systemFontDef._dimensions.width = _labelWidth;
+    systemFontDef._dimensions.width = _labelWidth == 0.f ? _maxLineWidth : _labelWidth;
     systemFontDef._dimensions.height = _labelHeight;
     systemFontDef._fontFillColor.r = _textColor.r;
     systemFontDef._fontFillColor.g = _textColor.g;