diff --git a/src/coreclr/System.Private.CoreLib/src/System/Collections/EmptyReadOnlyDictionaryInternal.cs b/src/coreclr/System.Private.CoreLib/src/System/Collections/EmptyReadOnlyDictionaryInternal.cs
index 9ade6db3557e56..1d026f03b3aa32 100644
--- a/src/coreclr/System.Private.CoreLib/src/System/Collections/EmptyReadOnlyDictionaryInternal.cs
+++ b/src/coreclr/System.Private.CoreLib/src/System/Collections/EmptyReadOnlyDictionaryInternal.cs
@@ -68,12 +68,6 @@ public object? this[object key]
             {
                 ArgumentNullException.ThrowIfNull(key);
 
-                if (!key.GetType().IsSerializable)
-                    throw new ArgumentException(SR.Argument_NotSerializable, nameof(key));
-
-                if ((value != null) && (!value.GetType().IsSerializable))
-                    throw new ArgumentException(SR.Argument_NotSerializable, nameof(value));
-
                 throw new InvalidOperationException(SR.InvalidOperation_ReadOnly);
             }
         }
@@ -91,12 +85,6 @@ public void Add(object key, object? value)
         {
             ArgumentNullException.ThrowIfNull(key);
 
-            if (!key.GetType().IsSerializable)
-                throw new ArgumentException(SR.Argument_NotSerializable, nameof(key));
-
-            if ((value != null) && (!value.GetType().IsSerializable))
-                throw new ArgumentException(SR.Argument_NotSerializable, nameof(value));
-
             throw new InvalidOperationException(SR.InvalidOperation_ReadOnly);
         }