diff --git a/ClosedXML/XLHelper.cs b/ClosedXML/XLHelper.cs
index b2bafb8..240e876 100644
--- a/ClosedXML/XLHelper.cs
+++ b/ClosedXML/XLHelper.cs
@@ -25,7 +25,7 @@
         internal static readonly NumberFormatInfo NumberFormatForParse = CultureInfo.InvariantCulture.NumberFormat;
         internal static readonly Graphics Graphic = Graphics.FromImage(new Bitmap(200, 200));
         internal static readonly Double DpiX = Graphic.DpiX;
-        internal static readonly NumberStyles NumberStyle = NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign | NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite;
+        internal static readonly NumberStyles NumberStyle = NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign | NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite | NumberStyles.AllowExponent;
         internal static readonly CultureInfo ParseCulture = CultureInfo.InvariantCulture;
 
         internal static readonly Regex A1SimpleRegex = new Regex(
@@ -166,7 +166,7 @@
         public static Boolean IsValidRangeAddress(IXLRangeAddress rangeAddress)
         {
 
-            return !rangeAddress.IsInvalid 
+            return !rangeAddress.IsInvalid
                    && rangeAddress.FirstAddress.RowNumber >= 1 && rangeAddress.LastAddress.RowNumber <= MaxRowNumber
                    && rangeAddress.FirstAddress.ColumnNumber >= 1 && rangeAddress.LastAddress.ColumnNumber <= MaxColumnNumber
                    && rangeAddress.FirstAddress.RowNumber <= rangeAddress.LastAddress.RowNumber
@@ -301,4 +301,4 @@
             return (DateTime)Convert.ChangeType(v, typeof(DateTime));
         }
     }
-}
\ No newline at end of file
+}