diff --git a/mixins/withAPI.ts b/mixins/withAPI.ts
index 8b49847..0affef5 100644
--- a/mixins/withAPI.ts
+++ b/mixins/withAPI.ts
@@ -14,7 +14,7 @@ type APIClass = new (...args: any[]) => {
   api: AxiosInstance
 }
 
-export function getAPIErrorMessage(error: AxiosError): string {
+function getAPIErrorMessage(error: AxiosError): string {
   return error.message
 }