Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/RingtoetsMacroStabilityInwardsSurfaceLine.cs
===================================================================
diff -u -rb04ee63f77708d3e30dd18f07dbb8ab31d548edb -rec27d9f02dc27c2829ed45788fae7d5923d63d3d
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/RingtoetsMacroStabilityInwardsSurfaceLine.cs	(.../RingtoetsMacroStabilityInwardsSurfaceLine.cs)	(revision b04ee63f77708d3e30dd18f07dbb8ab31d548edb)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Primitives/RingtoetsMacroStabilityInwardsSurfaceLine.cs	(.../RingtoetsMacroStabilityInwardsSurfaceLine.cs)	(revision ec27d9f02dc27c2829ed45788fae7d5923d63d3d)
@@ -577,11 +577,8 @@
             {
                 return true;
             }
-            if (obj.GetType() != GetType())
-            {
-                return false;
-            }
-            return Equals((RingtoetsMacroStabilityInwardsSurfaceLine) obj);
+            var other = obj as RingtoetsMacroStabilityInwardsSurfaceLine;
+            return other != null && Equals((RingtoetsMacroStabilityInwardsSurfaceLine) obj);
         }
 
         public override int GetHashCode()