diff --git a/tap_shopify/client.py b/tap_shopify/client.py
index f0d89f4..f61886a 100644
--- a/tap_shopify/client.py
+++ b/tap_shopify/client.py
@@ -32,7 +32,7 @@ def authenticator(self):
         return tap_shopifyAuthenticator(
             self,
             key="X-Shopify-Access-Token",
-            value=self.config["access_token"],
+            value=str(self.config["access_token"]),
             location="header",
         )