diff --git a/cmd/kubeadm/app/apis/kubeadm/v1beta2/bootstraptokenstring.go b/cmd/kubeadm/app/apis/kubeadm/v1beta2/bootstraptokenstring.go
index 2408f5e33b8..f6f42e9342e 100644
--- a/cmd/kubeadm/app/apis/kubeadm/v1beta2/bootstraptokenstring.go
+++ b/cmd/kubeadm/app/apis/kubeadm/v1beta2/bootstraptokenstring.go
@@ -40,7 +40,7 @@ func (bts BootstrapTokenString) MarshalJSON() ([]byte, error) {
 	return []byte(fmt.Sprintf(`"%s"`, bts.String())), nil
 }
 
-// UnmarshalJSON implements the json.Unmarshaller interface.
+// UnmarshalJSON implements the json.Unmarshaler interface.
 func (bts *BootstrapTokenString) UnmarshalJSON(b []byte) error {
 	// If the token is represented as "", just return quickly without an error
 	if len(b) == 0 {