1 files changed, 3 insertions, 2 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Reflection/CustomAttributeFormatException.cs b/src/System.Private.CoreLib/shared/System/Reflection/CustomAttributeFormatException.cs
index 1d7d4a7671..0d38eaaebc 100644
--- a/src/System.Private.CoreLib/shared/System/Reflection/CustomAttributeFormatException.cs
+++ b/src/System.Private.CoreLib/shared/System/Reflection/CustomAttributeFormatException.cs
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+#nullable enable
 using System.Runtime.Serialization;
 
 namespace System.Reflection
@@ -15,12 +16,12 @@ namespace System.Reflection
         {
         }
 
-        public CustomAttributeFormatException(string message)
+        public CustomAttributeFormatException(string? message)
             : this(message, null)
         {
         }
 
-        public CustomAttributeFormatException(string message, Exception inner)
+        public CustomAttributeFormatException(string? message, Exception? inner)
             : base(message, inner)
         {
             HResult = HResults.COR_E_CUSTOMATTRIBUTEFORMAT;