diff --git a/src/libraries/System.Private.Xml.Linq/src/System/Xml/Linq/XContainer.cs b/src/libraries/System.Private.Xml.Linq/src/System/Xml/Linq/XContainer.cs
index 7349bdd33104a0..b96094746ea465 100644
--- a/src/libraries/System.Private.Xml.Linq/src/System/Xml/Linq/XContainer.cs
+++ b/src/libraries/System.Private.Xml.Linq/src/System/Xml/Linq/XContainer.cs
@@ -880,8 +880,8 @@ internal async Task ReadContentFromAsync(XmlReader r, LoadOptions o, Cancellatio
 
         private sealed class ContentReader
         {
-            private readonly NamespaceCache _eCache;
-            private readonly NamespaceCache _aCache;
+            private NamespaceCache _eCache;
+            private NamespaceCache _aCache;
             private readonly IXmlLineInfo? _lineInfo;
             private XContainer _currentContainer;
             private string? _baseUri;