diff --git a/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs b/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs
index 6c6a1a05..1244b05f 100644
--- a/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs
+++ b/Src/Newtonsoft.Json.Tests/JsonConvertTest.cs
@@ -1399,5 +1399,16 @@ namespace Newtonsoft.Json.Tests
                 writer.WriteValue(Math.Round((double)value, _precision, _rounding));
             }
         }
+
+        [Test]
+        public void GenericBaseClassSerialization()
+        {
+            string json = JsonConvert.SerializeObject (new NonGenericChildClass ());
+            Assert.AreEqual ("{\"Data\":null}", json);
+        }
+
+        public class GenericBaseClass<O, T> { public virtual T Data { get; set; } }
+        public class GenericIntermediateClass<O> : GenericBaseClass<O, string> { public override string Data { get; set; } }
+        public class NonGenericChildClass : GenericIntermediateClass<int> { }
     }
 }
\ No newline at end of file
diff --git a/Src/Newtonsoft.Json/Utilities/ReflectionUtils.cs b/Src/Newtonsoft.Json/Utilities/ReflectionUtils.cs
index cf22842a..89ed5bd6 100644
--- a/Src/Newtonsoft.Json/Utilities/ReflectionUtils.cs
+++ b/Src/Newtonsoft.Json/Utilities/ReflectionUtils.cs
@@ -967,7 +967,7 @@ namespace Newtonsoft.Json.Utilities
                             int index = initialProperties.IndexOf(p => p.Name == subTypeProperty.Name
                                                                        && p.IsVirtual()
                                                                        && p.GetBaseDefinition() != null
-                                                                       && p.GetBaseDefinition().DeclaringType.IsAssignableFrom(subTypeProperty.DeclaringType));
+                                                                       && p.GetBaseDefinition().DeclaringType.IsAssignableFrom(subTypeProperty.GetBaseDefinition().DeclaringType));
 
                             if (index == -1)
                                 initialProperties.Add(subTypeProperty);