diff --git a/Schema Tests/readOnly/DefaultValueTests.cs b/Schema Tests/readOnly/DefaultValueTests.cs
index cac79e4..d7b4323 100644
--- a/Schema Tests/readOnly/DefaultValueTests.cs	
+++ b/Schema Tests/readOnly/DefaultValueTests.cs	
@@ -5,9 +5,9 @@
 namespace schema.readOnly {
   internal class DefaultValueTests {
     [Test]
+    [TestCase("null")]
     [TestCase("false")]
     [TestCase("true")]
-    [TestCase("null")]
     public void TestSupportsDefaultBools(string boolValue) {
       ReadOnlyGeneratorTestUtil.AssertGenerated(
           $$"""
@@ -36,10 +36,10 @@ public interface IReadOnlyWrapper {
     }
 
     [Test]
+    [TestCase("null")]
     [TestCase("0")]
     [TestCase("-123")]
     [TestCase("123")]
-    [TestCase("null")]
     public void TestSupportsDefaultInts(string intValue) {
       ReadOnlyGeneratorTestUtil.AssertGenerated(
           $$"""
@@ -66,5 +66,43 @@ public interface IReadOnlyWrapper {
 
             """);
     }
+
+    [Test]
+    [TestCase("null", "null")]
+    [TestCase("SomeType.FOO", "(other.SomeType) 123")]
+    public void
+        TestSupportsDefaultEnums(string enumValue, string readonlyValue) {
+      ReadOnlyGeneratorTestUtil.AssertGenerated(
+          $$"""
+            using schema.readOnly;
+            using foo.bar.other;
+
+            namespace foo.bar.other {
+              public enum SomeType {
+                FOO = 123,
+              }
+            }
+
+            namespace foo.bar {
+              [GenerateReadOnly]
+              public partial interface IWrapper {
+                [Const]
+                public void Foo(SomeType? value = {{enumValue}});
+              }
+            }
+            """,
+          $$"""
+            namespace foo.bar {
+              public partial interface IWrapper : IReadOnlyWrapper {
+                void IReadOnlyWrapper.Foo(other.SomeType? value) => Foo(value);
+              }
+              
+              public interface IReadOnlyWrapper {
+                public void Foo(other.SomeType? value = {{readonlyValue}});
+              }
+            }
+
+            """);
+    }
   }
 }
\ No newline at end of file
diff --git a/Schema Tests/readOnly/Enums.cs b/Schema Tests/readOnly/Enums.cs
new file mode 100644
index 0000000..d03b40e
--- /dev/null
+++ b/Schema Tests/readOnly/Enums.cs	
@@ -0,0 +1,11 @@
+namespace schema.readOnly {
+  internal enum SomeEnum {
+    FOO = 123,
+  }
+
+  [GenerateReadOnly]
+  internal partial interface ISomeWrapper {
+    [Const]
+    void Foo(SomeEnum? bar = SomeEnum.FOO);
+  }
+}
\ No newline at end of file
diff --git a/Schema/src/binary/parser/TypeInfo.cs b/Schema/src/binary/parser/TypeInfo.cs
index 05658f2..e83ed1b 100644
--- a/Schema/src/binary/parser/TypeInfo.cs
+++ b/Schema/src/binary/parser/TypeInfo.cs
@@ -277,7 +277,7 @@ private void ParseNullable_(ref ITypeSymbol typeSymbol,
         Asserts.True(typeSymbol.IsGeneric(out _, out var genericArguments));
         typeSymbol = genericArguments.ToArray()[0];
         isNullable = true;
-      } else if (typeSymbol.IsNullable()) {
+      } else if (typeSymbol.IsNullable(out _)) {
         isNullable = true;
       }
     }
diff --git a/Schema/src/readOnly/ReadOnlyTypeGenerator.cs b/Schema/src/readOnly/ReadOnlyTypeGenerator.cs
index a2c1f46..bb39133 100644
--- a/Schema/src/readOnly/ReadOnlyTypeGenerator.cs
+++ b/Schema/src/readOnly/ReadOnlyTypeGenerator.cs
@@ -342,27 +342,37 @@ var isIndexer
                 .Write(" ")
                 .Write(parameterSymbol.Name.EscapeKeyword());
 
+
+
             if (interfaceName == null &&
                 parameterSymbol.HasExplicitDefaultValue) {
+              var defaultValueType = parameterSymbol.Type.UnwrapNullable();
+              
               cbsb.Write(" = ");
 
               var explicitDefaultValue = parameterSymbol.ExplicitDefaultValue;
-              switch (explicitDefaultValue) {
-                case null:
-                  cbsb.Write("null");
-                  break;
-                case char:
-                  cbsb.Write($"'{explicitDefaultValue}'");
-                  break;
-                case string:
-                  cbsb.Write($"\"{explicitDefaultValue}\"");
-                  break;
-                case bool boolValue:
-                  cbsb.Write(boolValue ? "true" : "false");
-                  break;
-                default:
-                  cbsb.Write(explicitDefaultValue.ToString());
-                  break;
+              if (defaultValueType.IsEnum(out _) &&
+                  explicitDefaultValue != null) {
+                cbsb.Write(
+                    $"({typeSymbol.GetQualifiedNameFromCurrentSymbol(defaultValueType)}) {explicitDefaultValue}");
+              } else {
+                switch (explicitDefaultValue) {
+                  case null:
+                    cbsb.Write("null");
+                    break;
+                  case char:
+                    cbsb.Write($"'{explicitDefaultValue}'");
+                    break;
+                  case string:
+                    cbsb.Write($"\"{explicitDefaultValue}\"");
+                    break;
+                  case bool boolValue:
+                    cbsb.Write(boolValue ? "true" : "false");
+                    break;
+                  default:
+                    cbsb.Write(explicitDefaultValue.ToString());
+                    break;
+                }
               }
             }
           }
diff --git a/Schema/src/util/symbols/SymbolTypeUtil.cs b/Schema/src/util/symbols/SymbolTypeUtil.cs
index bc377d2..1dd3bd4 100644
--- a/Schema/src/util/symbols/SymbolTypeUtil.cs
+++ b/Schema/src/util/symbols/SymbolTypeUtil.cs
@@ -142,7 +142,7 @@ public static string GetQualifiedNameFromCurrentSymbol(
             $"{sourceSymbol.GetQualifiedNameFromCurrentSymbol(elementType, null, convertName, getNamespaceParts)}[]";
       }
 
-      if (referencedSymbol.IsNullable()) {
+      if (referencedSymbol.IsNullable(out _)) {
         if (referencedSymbol.IsType(typeof(Nullable<>))) {
           var referencedNamedTypeSymbol
               = Asserts.AsA<INamedTypeSymbol>(referencedSymbol);
diff --git a/Schema/src/util/symbols/TypeSymbolUtil.cs b/Schema/src/util/symbols/TypeSymbolUtil.cs
index 6aba9d2..db0613e 100644
--- a/Schema/src/util/symbols/TypeSymbolUtil.cs
+++ b/Schema/src/util/symbols/TypeSymbolUtil.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 
 using Microsoft.CodeAnalysis;
 
@@ -15,8 +16,26 @@ public static bool IsArray(this ITypeSymbol typeSymbol,
       return false;
     }
 
-    public static bool IsNullable(this ITypeSymbol typeSymbol)
-      => typeSymbol.NullableAnnotation == NullableAnnotation.Annotated;
+    public static ITypeSymbol UnwrapNullable(this ITypeSymbol typeSymbol)
+      => typeSymbol.IsNullable(out var nullableType)
+          ? nullableType
+          : typeSymbol;
+
+    public static bool IsNullable(this ITypeSymbol typeSymbol,
+                                  out ITypeSymbol nullableType) {
+      if (typeSymbol.IsType(typeof(Nullable<>))) {
+        nullableType = (typeSymbol as INamedTypeSymbol).TypeArguments[0];
+        return true;
+      }
+
+      if (typeSymbol.NullableAnnotation == NullableAnnotation.Annotated) {
+        nullableType = typeSymbol.OriginalDefinition;
+        return true;
+      }
+
+      nullableType = default;
+      return false;
+    }
 
     public static IEnumerable<INamedTypeSymbol> GetBaseTypes(
         this ISymbol symbol) {