diff --git a/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs b/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs
index 7ef801808e4e95..9f714c9dddac15 100644
--- a/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs
+++ b/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs
@@ -20,7 +20,7 @@ public NonSeekableStream(byte[] buffer) : base(buffer) { }
 
     public static IEnumerable<object[]> GetCanReadArrayOfAnySizeArgs()
     {
-        foreach (int size in new[] { 1, 127, 128, 512_001, 512_001 })
+        foreach (int size in new[] { 1, 127, 128, 20_001 })
         {
             yield return new object[] { size, true };
             yield return new object[] { size, false };