diff --git a/UnitTests/PListObjectTests.cs b/UnitTests/PListObjectTests.cs
index 752efb3..1bd46c7 100644
--- a/UnitTests/PListObjectTests.cs
+++ b/UnitTests/PListObjectTests.cs
@@ -53,6 +53,10 @@ namespace UnitTests
             new KeyValuePair<string, long> ("IntMaxValuePlusOne", ((long) int.MaxValue) + 1),
             new KeyValuePair<string, long> ("UIntMaxValue", uint.MaxValue),
             new KeyValuePair<string, long> ("UIntMaxValuePlusOne", ((long) uint.MaxValue) + 1),
+            new KeyValuePair<string, long> ("LongMaxValue", long.MaxValue),
+
+            // FIXME: Apple supports up to ulong.MaxValue
+            // new KeyValuePair<string, long> ("ULongMaxValue", ulong.MaxValue),
         };
 
         [TestCase ("xml-integers.plist")]
diff --git a/UnitTests/TestData/PropertyLists/binary-integers.plist b/UnitTests/TestData/PropertyLists/binary-integers.plist
index 79d2e8f..7c4e43d 100644
Binary files a/UnitTests/TestData/PropertyLists/binary-integers.plist and b/UnitTests/TestData/PropertyLists/binary-integers.plist differ
diff --git a/UnitTests/TestData/PropertyLists/xml-integers.plist b/UnitTests/TestData/PropertyLists/xml-integers.plist
index 9707278..77e423f 100644
--- a/UnitTests/TestData/PropertyLists/xml-integers.plist
+++ b/UnitTests/TestData/PropertyLists/xml-integers.plist
@@ -30,5 +30,7 @@
 	<integer>4294967295</integer>
 	<key>UIntMaxValuePlusOne</key>
 	<integer>4294967296</integer>
+	<key>LongMaxValue</key>
+	<integer>9223372036854775807</integer>
 </dict>
 </plist>