diff --git a/src/AppMotor.Core/Extensions/TypeExtensions.cs b/src/AppMotor.Core/Extensions/TypeExtensions.cs
index 9cb05bc5..ad7dfac5 100644
--- a/src/AppMotor.Core/Extensions/TypeExtensions.cs
+++ b/src/AppMotor.Core/Extensions/TypeExtensions.cs
@@ -316,7 +316,7 @@ public static bool Is(this Type typeToCheck, Type baseOrInterfaceType)
             //
             if (baseOrInterfaceType.IsInterface)
             {
-                var baseTypeFullName = baseOrInterfaceType.FullName!;
+                var interfaceTypeFullName = baseOrInterfaceType.FullName!;
 
                 //
                 // Try "Type.GetInterface()" first, if possible.
@@ -326,7 +326,7 @@ public static bool Is(this Type typeToCheck, Type baseOrInterfaceType)
                 {
                     try
                     {
-                        var implementedInterface = typeToCheck.GetInterface(baseTypeFullName);
+                        var implementedInterface = typeToCheck.GetInterface(interfaceTypeFullName);
                         return implementedInterface?.Assembly == baseOrInterfaceType.Assembly;
                     }
                     catch (AmbiguousMatchException)
diff --git a/tests/AppMotor.Core.Tests/Tests/Extensions/TypeExtensionsTests.cs b/tests/AppMotor.Core.Tests/Tests/Extensions/TypeExtensionsTests.cs
index 5a506dc6..0c08c70a 100644
--- a/tests/AppMotor.Core.Tests/Tests/Extensions/TypeExtensionsTests.cs
+++ b/tests/AppMotor.Core.Tests/Tests/Extensions/TypeExtensionsTests.cs
@@ -184,6 +184,7 @@ public void Test_Is()
     [Fact]
     public void Test_Is_OpenGeneric()
     {
+        // Non-nested types
         typeof(List<string>).Is(typeof(IReadOnlyCollection<>)).ShouldBe(true);
         typeof(List<>).Is(typeof(IReadOnlyCollection<>)).ShouldBe(true);
         typeof(List<>).Is(typeof(IReadOnlyCollection<string>)).ShouldBe(false);
@@ -191,6 +192,7 @@ public void Test_Is_OpenGeneric()
         typeof(List<>).Is(typeof(int)).ShouldBe(false);
         typeof(List<int>).Is(typeof(GenericClassA<>)).ShouldBe(false);
 
+        // Nested types
         typeof(GenericClassB<int, string>).Is(typeof(IGenericTestInterface<>)).ShouldBe(true);
         typeof(GenericClassB<int, string>).Is(typeof(GenericClassA<>)).ShouldBe(true);
         typeof(GenericClassC<int, string>).Is(typeof(GenericClassA<>)).ShouldBe(true);