diff --git a/schema.go b/schema.go
index 2b6aee8..e922496 100644
--- a/schema.go
+++ b/schema.go
@@ -49,8 +49,9 @@ func (s *Schema[T]) Refine(predicate func(T) bool) *Schema[T] {
 }
 
 func (s *Schema[T]) Parse(value any) *ValidationResult {
+	t := reflect.ValueOf(value).Kind().String()
 	val, ok := value.(T)
-	if !ok {
+	if !ok && t != reflect.TypeOf(val).String() {
 		return &ValidationResult{Errors: []ValidationError{{Path: "", Message: fmt.Sprintf("Expected %s, received %T", reflect.TypeOf(val).String(), value)}}}
 	}
 
diff --git a/string_test.go b/string_test.go
index 82b35de..013d6b2 100644
--- a/string_test.go
+++ b/string_test.go
@@ -103,3 +103,16 @@ func TestString_EndsWith(t *testing.T) {
 	assert.False(t, s.Parse("TEST").IsValid())
 	assert.False(t, s.Parse("3tes3t").IsValid())
 }
+
+type catalogueMarginLevel string
+type catalogueMargin int
+
+func TestString_CustomPrimitive(t *testing.T) {
+	s := schema.String()
+
+	v := catalogueMarginLevel("eebofleebo")
+	x := catalogueMargin(123)
+
+	assert.True(t, s.Parse(v).IsValid())
+	assert.False(t, s.Parse(x).IsValid())
+}