diff --git a/src/client.ts b/src/client.ts
index 12c5915..6bbeaaa 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -76,11 +76,11 @@ export function mapIssue(i: RawIssue): Issue {
   };
 }
 
-export function mapLabel(l: RawLabel): Label {
+function mapLabel(l: RawLabel): Label {
   return { name: l.name, color: l.color, description: l.description ?? null };
 }
 
-export function assertOwnerRepo(owner: string, repo: string): void {
+function assertOwnerRepo(owner: string, repo: string): void {
   if (!OWNER_REPO.test(owner)) throw new ValidationError(`invalid owner: ${owner}`);
   if (!OWNER_REPO.test(repo)) throw new ValidationError(`invalid repo: ${repo}`);
 }
diff --git a/src/http.ts b/src/http.ts
index 54a1f6f..844cf25 100644
--- a/src/http.ts
+++ b/src/http.ts
@@ -15,7 +15,7 @@ export interface HttpResponse<T> {
 const DEFAULT_BASE = "https://api.example-hub.test";
 const DEFAULT_UA = "hubclient/0.1.0";
 
-export function sleep(ms: number): Promise<void> {
+function sleep(ms: number): Promise<void> {
   return new Promise((resolve) => setTimeout(resolve, ms));
 }