Index: Ringtoets/Piping/test/Ringtoets.Piping.Primitives.Test/PipingSoilProfileTest.cs
===================================================================
diff -u -r669e99259a7cc575b5df2be2c0ea7105d9edcbcf -rec27d9f02dc27c2829ed45788fae7d5923d63d3d
--- Ringtoets/Piping/test/Ringtoets.Piping.Primitives.Test/PipingSoilProfileTest.cs	(.../PipingSoilProfileTest.cs)	(revision 669e99259a7cc575b5df2be2c0ea7105d9edcbcf)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Primitives.Test/PipingSoilProfileTest.cs	(.../PipingSoilProfileTest.cs)	(revision ec27d9f02dc27c2829ed45788fae7d5923d63d3d)
@@ -221,6 +221,20 @@
         }
 
         [Test]
+        public void Equals_DerivedClassWithEqualProperties_ReturnsTrue()
+        {
+            // Setup
+            PipingSoilProfile profile = CreateRandomProfile(2);
+            var derivedProfile = new TestProfile(profile);
+
+            // Call
+            bool areEqual = profile.Equals(derivedProfile);
+
+            // Assert
+            Assert.IsTrue(areEqual);
+        }
+
+        [Test]
         public void Equals_Null_ReturnsFalse()
         {
             // Setup
@@ -356,5 +370,15 @@
         {
             return new string('x', random.Next(0, 40));
         }
+
+        private class TestProfile : PipingSoilProfile
+        {
+            public TestProfile(PipingSoilProfile profile)
+                : base(profile.Name,
+                       profile.Bottom,
+                       profile.Layers,
+                       profile.SoilProfileType,
+                       profile.PipingSoilProfileId) {}
+        }
     }
 }
\ No newline at end of file