diff --git a/ClosedXML/Excel/Tables/XLTable.cs b/ClosedXML/Excel/Tables/XLTable.cs
index 5e8f3a6..4e193cf 100644
--- a/ClosedXML/Excel/Tables/XLTable.cs
+++ b/ClosedXML/Excel/Tables/XLTable.cs
@@ -107,7 +107,7 @@
         }
 
 
-        public String RelId { get; set; }
+        internal String RelId { get; set; }
 
         public IXLTableRange DataRange
         {
diff --git a/ClosedXML/Excel/XLWorksheet.cs b/ClosedXML/Excel/XLWorksheet.cs
index c622c30..6bd296d 100644
--- a/ClosedXML/Excel/XLWorksheet.cs
+++ b/ClosedXML/Excel/XLWorksheet.cs
@@ -121,7 +121,7 @@
         internal Boolean ColumnWidthChanged { get; set; }
 
         public Int32 SheetId { get; set; }
-        public String RelId { get; set; }
+        internal String RelId { get; set; }
         public XLDataValidations DataValidations { get; private set; }
         public IXLCharts Charts { get; private set; }
         public XLSheetProtection Protection { get; private set; }