diff --git a/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go b/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go
index c0e8927fe4e..c27380c19c6 100644
--- a/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go
+++ b/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go
@@ -131,6 +131,10 @@ func (IntOrString) OpenAPISchemaType() []string { return []string{"string"} }
 // the OpenAPI spec of this type.
 func (IntOrString) OpenAPISchemaFormat() string { return "int-or-string" }
 
+// OpenAPIV3OneOfTypes is used by the kube-openapi generator when constructing
+// the OpenAPI v3 spec of this type.
+func (IntOrString) OpenAPIV3OneOfTypes() []string { return []string{"integer", "string"} }
+
 func ValueOrDefault(intOrPercent *IntOrString, defaultValue IntOrString) *IntOrString {
 	if intOrPercent == nil {
 		return &defaultValue