diff --git a/SharpGen.E2ETests/RenameTests.cs b/SharpGen.E2ETests/RenameTests.cs
index 608f1f43..747c74a0 100644
--- a/SharpGen.E2ETests/RenameTests.cs
+++ b/SharpGen.E2ETests/RenameTests.cs
@@ -82,7 +82,46 @@ struct Test {
 
             var compilation = GetCompilationForGeneratedCode();
             var structType = compilation.GetTypeByMetadataName($"{nameof(MappingNameRuleRenamesStructMember)}.Test");
-            Assert.Equal(1, structType.GetMembers("MyField").Length);
+            Assert.Single(structType.GetMembers("MyField"));
+        }
+
+        [Fact]
+        public void MarkingMappingFinalPreservesUnderscore()
+        {
+            var testDirectory = GenerateTestDirectory();
+            var config = new Config.ConfigFile
+            {
+                Namespace = nameof(MarkingMappingFinalPreservesUnderscore),
+                Assembly = nameof(MarkingMappingFinalPreservesUnderscore),
+                IncludeDirs = { GetTestFileIncludeRule() },
+                Includes =
+                {
+                    CreateCppFile("simpleStruct", @"
+                        struct Test {
+                            int _testfield;
+                        };
+                    ")
+                },
+                Bindings =
+                {
+                    new Config.BindRule("int", "System.Int32")
+                },
+                Mappings =
+                {
+                    new Config.MappingRule
+                    {
+                        Field = "Test::_testfield",
+                        MappingName = "_field",
+                        IsFinalMappingName = true
+                    }
+                }
+            };
+            var result = RunWithConfig(config);
+            AssertRanSuccessfully(result.success, result.output);
+
+            var compilation = GetCompilationForGeneratedCode();
+            var structType = compilation.GetTypeByMetadataName($"{nameof(MarkingMappingFinalPreservesUnderscore)}.Test");
+            Assert.Single(structType.GetMembers("_field"));
         }
     }
 }