diff --git a/OpenXmlFormats/Spreadsheet/Styles/CT_CellStyleXfs.cs b/OpenXmlFormats/Spreadsheet/Styles/CT_CellStyleXfs.cs
index 6f851840a..5338b84c2 100644
--- a/OpenXmlFormats/Spreadsheet/Styles/CT_CellStyleXfs.cs
+++ b/OpenXmlFormats/Spreadsheet/Styles/CT_CellStyleXfs.cs
@@ -44,7 +44,7 @@ internal void Write(StreamWriter sw, string nodeName)
             {
                 foreach (CT_Xf x in this.xf)
                 {
-                    x.Write(sw, "xf");
+                    x.Write(sw, "xf", true);
                 }
             }
             sw.Write(string.Format("</{0}>", nodeName));
diff --git a/OpenXmlFormats/Spreadsheet/Styles/CT_Xf.cs b/OpenXmlFormats/Spreadsheet/Styles/CT_Xf.cs
index 621251dd7..3ae3e75cf 100644
--- a/OpenXmlFormats/Spreadsheet/Styles/CT_Xf.cs
+++ b/OpenXmlFormats/Spreadsheet/Styles/CT_Xf.cs
@@ -109,14 +109,15 @@ public static CT_Xf Parse(XmlNode node, XmlNamespaceManager namespaceManager)
 
 
 
-        internal void Write(StreamWriter sw, string nodeName)
+        internal void Write(StreamWriter sw, string nodeName, bool writingCellStyle=false)
         {
             sw.Write(string.Format("<{0}", nodeName));
             XmlHelper.WriteAttribute(sw, "numFmtId", this.numFmtId, true);
             XmlHelper.WriteAttribute(sw, "fontId", this.fontId, true);
             XmlHelper.WriteAttribute(sw, "fillId", this.fillId, true);
             XmlHelper.WriteAttribute(sw, "borderId", this.borderId, true);
-            XmlHelper.WriteAttribute(sw, "xfId", this.xfId, true);
+            if (!writingCellStyle)
+                XmlHelper.WriteAttribute(sw, "xfId", this.xfId, true);
             XmlHelper.WriteAttribute(sw, "quotePrefix", this.quotePrefix,false);
             XmlHelper.WriteAttribute(sw, "pivotButton", this.pivotButton, false);
             if(this.applyNumberFormat)