diff --git a/Elwig/Helpers/Export/Ods.cs b/Elwig/Helpers/Export/Ods.cs
index 41fa609..57bfd51 100644
--- a/Elwig/Helpers/Export/Ods.cs
+++ b/Elwig/Helpers/Export/Ods.cs
@@ -6,6 +6,7 @@ using System.Globalization;
 using System.IO;
 using System.IO.Compression;
 using System.Linq;
+using System.Security;
 using System.Threading.Tasks;
 
 namespace Elwig.Helpers.Export {
@@ -312,7 +313,7 @@ namespace Elwig.Helpers.Export {
                 }
                 c = $"<{ct} office:value-type=\"float\" calcext:value-type=\"float\" office:value=\"{v.ToString(CultureInfo.InvariantCulture)}\"{add}><text:p>{data}</text:p></{ct}>";
             } else {
-                c = $"<{ct} office:value-type=\"string\" calcext:value-type=\"string\"{add}><text:p>{data}</text:p></{ct}>";
+                c = $"<{ct} office:value-type=\"string\" calcext:value-type=\"string\"{add}><text:p>{SecurityElement.Escape(data.ToString())}</text:p></{ct}>";
             }
 
             return $"      {c}\r\n" + (colSpan > 1 ? $"      <table:covered-table-cell table:number-rows-repeated=\"{colSpan - 1}\"/>\r\n" : "");