diff --git a/app/model_downloader/credentials/store.py b/app/model_downloader/credentials/store.py
index c2023ccdc..ac82d24e3 100644
--- a/app/model_downloader/credentials/store.py
+++ b/app/model_downloader/credentials/store.py
@@ -115,7 +115,7 @@ class CredentialStore:
         values = {
             "host": host,
             "secret": secret,
-            "secret_last4": secret[-4:] if len(secret) >= 4 else secret,
+            "secret_last4": secret[-4:] if len(secret) > 4 else None,
             "auth_scheme": auth_scheme,
             "header_name": header_name,
             "query_param": query_param,