diff --git a/src/jsonifiable/makeJsonifiableSchemableClass.ts b/src/jsonifiable/makeJsonifiableSchemableClass.ts
index 36f0ad5..6d7843f 100644
--- a/src/jsonifiable/makeJsonifiableSchemableClass.ts
+++ b/src/jsonifiable/makeJsonifiableSchemableClass.ts
@@ -33,16 +33,16 @@ export function makeJsonifiableSchemableClass<
 
     Type                       extends ClassType = "AbstractClass"
 >(
-    props: {
-        extend: C | SchemableClass<
-            SchemaT,
-            SchemaUnknownKeys,
-            SchemaCatchall,
-            Values,
-            DefaultValues,
-            Type
-        >
+    extend: C | SchemableClass<
+        SchemaT,
+        SchemaUnknownKeys,
+        SchemaCatchall,
+        Values,
+        DefaultValues,
+        Type
+    >,
 
+    props: {
         jsonifySchema: (props: {
             schema:  C["schema"]
             shape:   C["schema"]["shape"]
@@ -64,19 +64,19 @@ export function makeJsonifiableSchemableClass<
             Values,
             JsonifiedValues
         >
-    }
+    },
 ) {
     const jsonifySchema = props.jsonifySchema({
-        schema:  props.extend.schema,
-        shape:   props.extend.schema.shape,
+        schema:  extend.schema,
+        shape:   extend.schema.shape,
     })
 
     const dejsonifySchema = props.dejsonifySchema({
-        schema:  props.extend.schema,
-        shape:   props.extend.schema.shape,
+        schema:  extend.schema,
+        shape:   extend.schema.shape,
     })
 
-    return class extends props.extend {
+    return class extends extend {
         static readonly jsonifySchema = jsonifySchema
                readonly jsonifySchema = jsonifySchema
 
diff --git a/src/tests.ts b/src/tests.ts
index bd17337..5e8740f 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -18,9 +18,7 @@ const UserProto = makeSchemableClass(z.object({
 UserProto.defaultValues
 
 
-const JsonifiableUserProto = makeJsonifiableSchemableClass({
-    extend: UserProto,
-
+const JsonifiableUserProto = makeJsonifiableSchemableClass(UserProto, {
     jsonifySchema: ({ schema, shape }) => schema.extend({
         id: jsonifyBigIntSchema(shape.id)
     }),