diff --git a/pkg/model/attr.go b/pkg/model/attr.go
index 5a29c9d5..701322f7 100644
--- a/pkg/model/attr.go
+++ b/pkg/model/attr.go
@@ -21,10 +21,11 @@ import (
 )
 
 type Attr struct {
-	Names  names.Names
-	GoType string
-	Shape  *awssdkmodel.Shape
-	GoTag  string
+	Names       names.Names
+	GoType      string
+	Shape       *awssdkmodel.Shape
+	GoTag       string
+	IsImmutable bool
 }
 
 func NewAttr(
diff --git a/pkg/model/model.go b/pkg/model/model.go
index eb0594e5..5df18a74 100644
--- a/pkg/model/model.go
+++ b/pkg/model/model.go
@@ -541,6 +541,9 @@ func (m *Model) processNestedFieldTypeDefs(
 			if field.FieldConfig.GoTag != nil {
 				setTypeDefAttributeGoTag(crd, fieldPath, field, tdefs)
 			}
+			if field.IsImmutable() {
+				setTypeDefAttributeImmutable(crd, fieldPath, tdefs)
+			}
 		}
 	}
 }
@@ -674,6 +677,15 @@ func setTypeDefAttributeGoTag(crd *CRD, fieldPath string, f *Field, tdefs []*Typ
 	}
 }
 
+// setTypeDefAttributeImmutable sets the IsImmutable flag for the corresponding
+// attribute represented by fieldPath of nested field.
+func setTypeDefAttributeImmutable(crd *CRD, fieldPath string, tdefs []*TypeDef) {
+	_, fieldAttr := getAttributeFromPath(crd, fieldPath, tdefs)
+	if fieldAttr != nil {
+		fieldAttr.IsImmutable = true
+	}
+}
+
 // updateTypeDefAttributeWithReference adds a new AWSResourceReference attribute
 // for the corresponding attribute represented by fieldPath of nested field
 func updateTypeDefAttributeWithReference(crd *CRD, fieldPath string, tdefs []*TypeDef) {
diff --git a/templates/apis/type_def.go.tpl b/templates/apis/type_def.go.tpl
index 6034ea71..0166fe9f 100644
--- a/templates/apis/type_def.go.tpl
+++ b/templates/apis/type_def.go.tpl
@@ -7,6 +7,9 @@ type {{ .Names.Camel }} struct {
 	{{- if $attr.Shape.Documentation }}
 	{{ $attr.Shape.Documentation }}
 	{{- end }}
+	{{- if $attr.IsImmutable }}
+	// +kubebuilder:validation:XValidation:rule="self == oldSelf",message="Value is immutable once set"
+	{{- end }}
 	{{ $attr.Names.Camel }} {{ $attr.GoType }} {{ $attr.GetGoTag }}
 {{- end }}
 }