diff --git a/src/System.ServiceModel.Security/tests/ServiceModel/SecutityBindingElementTest.cs b/src/System.ServiceModel.Security/tests/ServiceModel/SecutityBindingElementTest.cs
index 54a85585782..988e97fee18 100644
--- a/src/System.ServiceModel.Security/tests/ServiceModel/SecutityBindingElementTest.cs
+++ b/src/System.ServiceModel.Security/tests/ServiceModel/SecutityBindingElementTest.cs
@@ -35,4 +35,11 @@ public static void Property_DefaultAlgorithmSuite()
         TransportSecurityBindingElement securityBindingElement = new TransportSecurityBindingElement();
         Assert.Equal(securityBindingElement.DefaultAlgorithmSuite, SecurityAlgorithmSuite.Basic256);
     }
+
+    [WcfFact]
+    public static void Property_KeyEntropyMode()
+    {
+        TransportSecurityBindingElement securityBindingElement = new TransportSecurityBindingElement();
+        Assert.Equal(securityBindingElement.KeyEntropyMode, SecurityKeyEntropyMode.CombinedEntropy);
+    }
 }