Index: Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.Data.Test/HeightStructuresFailureMechanismTest.cs
===================================================================
diff -u -r7ddd944b70d252ae493bba48ea9b31c01634082d -r89e5c41b732ccf30350026e8d35a01d9a180fdfc
--- Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.Data.Test/HeightStructuresFailureMechanismTest.cs	(.../HeightStructuresFailureMechanismTest.cs)	(revision 7ddd944b70d252ae493bba48ea9b31c01634082d)
+++ Ringtoets/HeightStructures/test/Ringtoets.HeightStructures.Data.Test/HeightStructuresFailureMechanismTest.cs	(.../HeightStructuresFailureMechanismTest.cs)	(revision 89e5c41b732ccf30350026e8d35a01d9a180fdfc)
@@ -126,5 +126,20 @@
             Assert.IsTrue(calculations.All(c => c is HeightStructuresCalculation));
             mocks.VerifyAll();
         }
+
+        [Test]
+        public void Contribution_Always_UpdatesNormProbabilityInputContribution()
+        {
+            // Setup
+            var failureMechanism = new HeightStructuresFailureMechanism();
+            const double newContribution = 12;
+
+            // Call
+            failureMechanism.Contribution = newContribution;
+
+            // Assert
+            Assert.AreEqual(newContribution, failureMechanism.NormProbabilityInput.Contribution);
+            Assert.AreEqual(newContribution, failureMechanism.Contribution);
+        }
     }
 }
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