diff --git a/OpenXmlFormats/Spreadsheet/Sheet.cs b/OpenXmlFormats/Spreadsheet/Sheet.cs
index 538ff99e1..3af720ad9 100644
--- a/OpenXmlFormats/Spreadsheet/Sheet.cs
+++ b/OpenXmlFormats/Spreadsheet/Sheet.cs
@@ -2694,8 +2694,8 @@ internal void Write(StreamWriter sw, string nodeName)
                 XmlHelper.WriteAttribute(sw, "t", this.t.ToString());
             XmlHelper.WriteAttribute(sw, "aca", this.aca, false);
             XmlHelper.WriteAttribute(sw, "ref", this.@ref);
-            XmlHelper.WriteAttribute(sw, "dt2D", this.dt2D, true);
-            XmlHelper.WriteAttribute(sw, "dtr", this.dtr, true);
+            XmlHelper.WriteAttribute(sw, "dt2D", this.dt2D, false);
+            XmlHelper.WriteAttribute(sw, "dtr", this.dtr, false);
             XmlHelper.WriteAttribute(sw, "del1", this.del1, false);
             XmlHelper.WriteAttribute(sw, "del2", this.del2, false);
             XmlHelper.WriteAttribute(sw, "r1", this.r1);