diff --git a/CapnpC.CSharp.Generator/CodeGen/GenNames.cs b/CapnpC.CSharp.Generator/CodeGen/GenNames.cs
index 1587449..42c5938 100644
--- a/CapnpC.CSharp.Generator/CodeGen/GenNames.cs
+++ b/CapnpC.CSharp.Generator/CodeGen/GenNames.cs
@@ -78,9 +78,9 @@ namespace CapnpC.CSharp.Generator.CodeGen
             ContextParameter = new Name(options.ContextParameterName);
             GroupReaderContextArg = new Name(options.GroupReaderContextArgName);
             GroupWriterContextArg = new Name(options.GroupWriterContextArgName);
-            UnionDiscriminatorEnum = new Name(options.UnionDisciminatorEnumName);
+            UnionDiscriminatorEnum = new Name(options.UnionDiscriminatorEnumName);
             UnionDiscriminatorProp = new Name(options.UnionDiscriminatorPropName);
-            UnionDiscriminatorUndefined = new Name(options.UnionDisciminatorUndefinedName);
+            UnionDiscriminatorUndefined = new Name(options.UnionDiscriminatorUndefinedName);
             UnionDiscriminatorField = new Name(options.UnionDiscriminatorFieldName);
             UnionContentField = new Name(options.UnionContentFieldName);
             SerializeMethod = new Name(options.SerializeMethodName);
diff --git a/CapnpC.CSharp.Generator/CodeGen/GeneratorOptions.cs b/CapnpC.CSharp.Generator/CodeGen/GeneratorOptions.cs
index 329f553..8357cee 100644
--- a/CapnpC.CSharp.Generator/CodeGen/GeneratorOptions.cs
+++ b/CapnpC.CSharp.Generator/CodeGen/GeneratorOptions.cs
@@ -12,10 +12,10 @@
         public string ContextParameterName { get; set; } = "ctx";
         public string GroupReaderContextArgName { get; set; } = "ctx";
         public string GroupWriterContextArgName { get; set; } = "ctx";
-        public string UnionDisciminatorEnumName { get; set; } = "WHICH";
+        public string UnionDiscriminatorEnumName { get; set; } = "WHICH";
         public string UnionDiscriminatorPropName { get; set; } = "which";
         public string UnionDiscriminatorFieldName { get; set; } = "_which";
-        public string UnionDisciminatorUndefinedName { get; set; } = "undefined";
+        public string UnionDiscriminatorUndefinedName { get; set; } = "undefined";
         public string UnionContentFieldName { get; set; } = "_content";
         public string SerializeMethodName { get; set; } = "serialize";
         public string ApplyDefaultsMethodName { get; set; } = "applyDefaults";