diff --git a/src/iSynaptic.Core.Serialization/ResultJsonConverter.cs b/src/iSynaptic.Core.Serialization/ResultJsonConverter.cs
index 0f3d3c9..7946850 100644
--- a/src/iSynaptic.Core.Serialization/ResultJsonConverter.cs
+++ b/src/iSynaptic.Core.Serialization/ResultJsonConverter.cs
@@ -66,7 +66,7 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
         {
             Type[] typeArguments = objectType.GetGenericArguments();
 
-            Type valueType = typeArguments[1];
+            Type valueType = typeArguments[0];
             Type observationType = typeArguments[1];
             Type arrayType = observationType.MakeArrayType();
 
diff --git a/src/iSynaptic.Core.UnitTests/Serialization/ResultJsonConverterTests.cs b/src/iSynaptic.Core.UnitTests/Serialization/ResultJsonConverterTests.cs
index 2a3cd4d..8bcf091 100644
--- a/src/iSynaptic.Core.UnitTests/Serialization/ResultJsonConverterTests.cs
+++ b/src/iSynaptic.Core.UnitTests/Serialization/ResultJsonConverterTests.cs
@@ -26,6 +26,7 @@
 using NUnit.Framework;
 using Newtonsoft.Json;
 using iSynaptic.Commons;
+using iSynaptic.TestDomain;
 
 namespace iSynaptic.Serialization
 {
@@ -273,5 +274,18 @@ public void ReadJson_FailureWithValueAndObservations_WritesCorrectly()
             result.WasSuccessful.Should().BeFalse();
             result.Observations.Should().Contain("Something bad happened!", "Really bad!");
         }
+
+        [Test]
+        public void ReadJson_ValueTypeIsNeededToDeserialize_ReadsCorrectly()
+        {
+            var id = Guid.NewGuid();
+            var input = "{\"value\":{\"$type\":\"ServiceCaseId\",\"Value\":\"" + id + "\"},\"wasSuccessful\":true}";
+
+            var result = _serializer.Deserialize<Result<ServiceCaseId, string>>(input);
+
+            result.Value.Should().BeOfType<ServiceCaseId>();
+            result.Cast<ServiceCaseId>().Value.Should().Be(new ServiceCaseId(id));
+            result.Observations.Should().BeEmpty();
+        }
     }
 }