Index: Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/ClosingStructuresInputTest.cs
===================================================================
diff -u -r1a6804681b0758a5761e39099e4b6de65f9cf4a2 -r41a37c93cb0b3e36ff7023c9f42b4e6225598b55
--- Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/ClosingStructuresInputTest.cs	(.../ClosingStructuresInputTest.cs)	(revision 1a6804681b0758a5761e39099e4b6de65f9cf4a2)
+++ Ringtoets/ClosingStructures/test/Ringtoets.ClosingStructures.Data.Test/ClosingStructuresInputTest.cs	(.../ClosingStructuresInputTest.cs)	(revision 41a37c93cb0b3e36ff7023c9f42b4e6225598b55)
@@ -39,7 +39,7 @@
             // Setup
             var insideWaterLevel = new NormalDistribution(2)
             {
-                Mean = (RoundedDouble) double.NaN,
+                Mean = RoundedDouble.NaN,
                 StandardDeviation = (RoundedDouble) 0.1
             };
 
@@ -51,19 +51,19 @@
 
             var thresholdHeightOpenWeir = new NormalDistribution(2)
             {
-                Mean = (RoundedDouble) double.NaN,
+                Mean = RoundedDouble.NaN,
                 StandardDeviation = (RoundedDouble) 0.1
             };
 
             var areaFlowApertures = new LogNormalDistribution(2)
             {
-                Mean = (RoundedDouble) double.NaN,
+                Mean = RoundedDouble.NaN,
                 StandardDeviation = (RoundedDouble) 0.01
             };
 
             var levelCrestStructureNotClosing = new NormalDistribution(2)
             {
-                Mean = (RoundedDouble) double.NaN,
+                Mean = RoundedDouble.NaN,
                 StandardDeviation = (RoundedDouble) 0.05
             };