diff --git a/src/OverteAuth.hpp b/src/OverteAuth.hpp
index c669f7e..da2aaf3 100644
--- a/src/OverteAuth.hpp
+++ b/src/OverteAuth.hpp
@@ -31,7 +31,7 @@ private:
     std::string m_accessToken;
     std::string m_refreshToken;
     std::string m_username;
-    uint64_t m_tokenExpiresAt{0}; // Unix timestamp
+    std::uint64_t m_tokenExpiresAt{0}; // Unix timestamp
     
     // libcurl callback for writing response data
     static size_t writeCallback(void* contents, size_t size, size_t nmemb, void* userp);