diff --git a/src/traits/ZodSchemaObject.ts b/src/traits/ZodSchemaObject.ts
index be4daf9..48b2f44 100644
--- a/src/traits/ZodSchemaObject.ts
+++ b/src/traits/ZodSchemaObject.ts
@@ -35,22 +35,19 @@ export const ZodSchemaObject = <
         static readonly schema                   = schema
         static readonly schemaWithDefaultsValues = schemaWithDefaultValues(schema)
 
-        static instantiationSchema<
-            Self     extends StaticMembers<ImplStaticThis<typeof ZodSchemaObject>>,
-            Instance extends Values,
-        >(
-            this: Class<Instance, [values: Values]> & Self
-        ) {
-            return this.schema.transform(values => new this(values))
-        }
+        static instantiationTransform<
+            Instance    extends Values,
 
-        static instantiationSchemaWithDefaultValues<
-            Self     extends StaticMembers<ImplStaticThis<typeof ZodSchemaObject>>,
-            Instance extends Values,
+            T           extends z.ZodRawShape,
+            UnknownKeys extends z.UnknownKeysParam,
+            Catchall    extends z.ZodTypeAny,
+            Output      extends Values,
+            Input,
         >(
-            this: Class<Instance, [values: Values]> & Self
+            this:    Class<Instance, [values: Values]>,
+            schema:  z.ZodObject<T, UnknownKeys, Catchall, Output, Input>,
         ) {
-            return this.schemaWithDefaultsValues.transform(values => new this(values))
+            return schema.transform(values => new this(values))
         }
 
 
@@ -61,7 +58,9 @@ export const ZodSchemaObject = <
             this: Class<Instance, [values: Values]> & Self,
             ...[values, params]: NewZodSchemaInstanceArgs<PartialValues>
         ) {
-            return this.instantiationSchemaWithDefaultValues().parse(values, params)
+            return this
+                .instantiationTransform(this.schemaWithDefaultsValues)
+                .parse(values, params)
         }
 
         static createPromise<
@@ -71,7 +70,9 @@ export const ZodSchemaObject = <
             this: Class<Instance, [values: Values]> & Self,
             ...[values, params]: NewZodSchemaInstanceArgs<PartialValues>
         ) {
-            return this.instantiationSchemaWithDefaultValues().parseAsync(values, params)
+            return this
+                .instantiationTransform(this.schemaWithDefaultsValues)
+                .parseAsync(values, params)
         }
 
         static createEffect<
@@ -81,7 +82,11 @@ export const ZodSchemaObject = <
             this: Class<Instance, [values: Values]> & Self,
             ...[values, params]: NewZodSchemaInstanceArgs<PartialValues>
         ) {
-            return parseZodSchemaEffect(this.instantiationSchemaWithDefaultValues(), values, params)
+            return parseZodSchemaEffect(
+                this.instantiationTransform(this.schemaWithDefaultsValues),
+                values,
+                params,
+            )
         }
     })
     .build()