diff --git a/UnitsNet.Tests/BaseDimensionsTests.cs b/UnitsNet.Tests/BaseDimensionsTests.cs
index 2dc4c95ce8..26a81fad36 100644
--- a/UnitsNet.Tests/BaseDimensionsTests.cs
+++ b/UnitsNet.Tests/BaseDimensionsTests.cs
@@ -101,6 +101,11 @@ public void InequalityOperatorsWorkAsExpected()
 
             Assert.True(baseDimensions2 != null);
             Assert.True(null != baseDimensions2);
+
+            BaseDimensions nullBaseDimensions1 = null;
+            BaseDimensions nullBaseDimensions2 = null;
+
+            Assert.False(nullBaseDimensions1 != nullBaseDimensions2);
         }
 
         [Fact]
diff --git a/UnitsNet.Tests/BaseUnitsTests.cs b/UnitsNet.Tests/BaseUnitsTests.cs
index 6617f85f88..16dacb1630 100644
--- a/UnitsNet.Tests/BaseUnitsTests.cs
+++ b/UnitsNet.Tests/BaseUnitsTests.cs
@@ -129,6 +129,11 @@ public void InequalityOperatorIsImplementedCorrectly()
 
             Assert.True(baseUnits1 != null);
             Assert.True(null != baseUnits1);
+
+            BaseUnits nullBaseUnits1 = null;
+            BaseUnits nullBaseUnits2 = null;
+
+            Assert.False(nullBaseUnits1 != nullBaseUnits2);
         }
 
         [Fact]
diff --git a/UnitsNet.Tests/UnitSystemTests.cs b/UnitsNet.Tests/UnitSystemTests.cs
index c6970c00e6..2a52e693c5 100644
--- a/UnitsNet.Tests/UnitSystemTests.cs
+++ b/UnitsNet.Tests/UnitSystemTests.cs
@@ -146,6 +146,11 @@ public void InequalityOperatorIsImplementedCorrectly()
 
             Assert.True(unitSystem1 != null);
             Assert.True(null != unitSystem1);
+
+            UnitSystem nullUnitSystem1 = null;
+            UnitSystem nullUnitSystem2 = null;
+
+            Assert.False(nullUnitSystem1 != nullUnitSystem2);
         }
 
         [Fact]