diff --git a/fcm.go b/fcm.go
index 4eb0751..46942fb 100644
--- a/fcm.go
+++ b/fcm.go
@@ -47,7 +47,7 @@ var (
 	AuthScopes = []string{"https://www.googleapis.com/auth/firebase.messaging"}
 )
 
-func MakeSendEndpoint(projectId string) string {
+func makeSendEndpoint(projectId string) string {
 	return fmt.Sprintf("https://fcm.googleapis.com/v1/projects/%s/messages:send", projectId)
 }
 
@@ -88,7 +88,7 @@ type Client struct {
 
 func NewClient(projectId string, ts oauth2.TokenSource, hc *http.Client, logger logr.Logger) *Client {
 	return &Client{
-		sendEndpoint: MakeSendEndpoint(projectId),
+		sendEndpoint: makeSendEndpoint(projectId),
 		ts:           ts,
 		hc:           hc,
 		logger:       logger,