diff --git a/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs b/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs
index 7e8ad830..b6caf537 100644
--- a/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs
+++ b/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs
@@ -26,6 +26,9 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+#if !(NET20 || NET35 || PORTABLE40 || PORTABLE)
+using System.Numerics;
+#endif
 using System.Runtime.Serialization;
 using System.Text;
 #if !(NET20 || NET35)
@@ -995,17 +998,22 @@ now brown cow?", '"', true);
             Assert.AreEqual("Bad Boys", m.Name);
         }
 
+#if !(NET20 || NET35 || PORTABLE40 || PORTABLE)
         [Test]
         public void IntegerLengthOverflows()
         {
             // Maximum javascript number length (in characters) is 380
-
-            dynamic d = JObject.Parse(@"{""biginteger"":" + new String('9', 380) + "}");
+            JObject o = JObject.Parse(@"{""biginteger"":" + new String('9', 380) + "}");
+            JValue v = (JValue)o["biginteger"];
+            Assert.AreEqual(JTokenType.Integer, v.Type);
+            Assert.AreEqual(typeof(BigInteger), v.Value.GetType());
+            Assert.AreEqual(BigInteger.Parse(new String('9', 380)), (BigInteger)v.Value);
 
             ExceptionAssert.Throws<JsonReaderException>(
                 "JSON integer " + new String('9', 381) + " is too large to parse. Path 'biginteger', line 1, position 395.",
                 () => JObject.Parse(@"{""biginteger"":" + new String('9', 381) + "}"));
         }
+#endif
 
         //[Test]
         public void StackOverflowTest()
diff --git a/Src/Newtonsoft.Json/JsonTextReader.cs b/Src/Newtonsoft.Json/JsonTextReader.cs
index 2879ab15..f126cf26 100644
--- a/Src/Newtonsoft.Json/JsonTextReader.cs
+++ b/Src/Newtonsoft.Json/JsonTextReader.cs
@@ -56,8 +56,7 @@ namespace Newtonsoft.Json
     public class JsonTextReader : JsonReader, IJsonLineInfo
     {
         private const char UnicodeReplacementChar = '\uFFFD';
-
-        private const int MaximumJavascriptIntegerLengthInCharacters = 380;
+        private const int MaximumJavascriptIntegerCharacterLength = 380;
 
         private readonly TextReader _reader;
         private char[] _chars;
@@ -1270,10 +1269,10 @@ namespace Newtonsoft.Json
                     {
 #if !(NET20 || NET35 || PORTABLE40 || PORTABLE)
                         string number = _stringReference.ToString();
-                        if (number.Length > MaximumJavascriptIntegerLengthInCharacters)
+
+                        if (number.Length > MaximumJavascriptIntegerCharacterLength)
                             throw JsonReaderException.Create(this, "JSON integer {0} is too large to parse.".FormatWith(CultureInfo.InvariantCulture, _stringReference.ToString()));
 
-                        
                         numberValue = BigInteger.Parse(number, CultureInfo.InvariantCulture);
                         numberType = JsonToken.Integer;
 #else