diff --git a/Source/SVGImage/SVG/PaintServer/RadialGradientColorPaintServer.cs b/Source/SVGImage/SVG/PaintServer/RadialGradientColorPaintServer.cs
index 0e5e265..37d71aa 100644
--- a/Source/SVGImage/SVG/PaintServer/RadialGradientColorPaintServer.cs
+++ b/Source/SVGImage/SVG/PaintServer/RadialGradientColorPaintServer.cs
@@ -20,11 +20,11 @@ public RadialGradientColorPaintServerPaintServer(PaintServerManager owner, XmlNo
             : base(owner, node)
         {
             System.Diagnostics.Debug.Assert(node.Name == SVGTags.sRadialGradient);
-            this.CX = XmlUtil.AttrValue(node, "cx", double.NaN);
-            this.CY = XmlUtil.AttrValue(node, "cy", double.NaN);
-            this.FX = XmlUtil.AttrValue(node, "fx", double.NaN);
-            this.FY = XmlUtil.AttrValue(node, "fy", double.NaN);
-            this.R = XmlUtil.AttrValue(node, "r", double.NaN);
+            this.CX = XmlUtil.AttrValue(node, "cx", 0.5);
+            this.CY = XmlUtil.AttrValue(node, "cy", 0.5);
+            this.FX = XmlUtil.AttrValue(node, "fx", this.CX);
+            this.FY = XmlUtil.AttrValue(node, "fy", this.CY);
+            this.R = XmlUtil.AttrValue(node, "r", 0.5);
             this.Normalize();
         }