diff --git a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go
index ca3a5d47876..aa5b519ae52 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go
+++ b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go
@@ -673,16 +673,6 @@ func ValidateCustomResourceDefinitionOpenAPISchema(schema *apiextensions.JSONSch
 		}
 	}
 
-	if len(schema.PatternProperties) != 0 {
-		for property, jsonSchema := range schema.PatternProperties {
-			allErrs = append(allErrs, ValidateCustomResourceDefinitionOpenAPISchema(&jsonSchema, fldPath.Child("patternProperties").Key(property), ssv)...)
-		}
-	}
-
-	if schema.AdditionalItems != nil {
-		allErrs = append(allErrs, ValidateCustomResourceDefinitionOpenAPISchema(schema.AdditionalItems.Schema, fldPath.Child("additionalItems"), ssv)...)
-	}
-
 	allErrs = append(allErrs, ValidateCustomResourceDefinitionOpenAPISchema(schema.Not, fldPath.Child("not"), ssv)...)
 
 	if len(schema.AllOf) != 0 {