diff --git a/pyinfra/storage/adapters/s3.py b/pyinfra/storage/adapters/s3.py
index dab3ec8..3db0488 100644
--- a/pyinfra/storage/adapters/s3.py
+++ b/pyinfra/storage/adapters/s3.py
@@ -66,7 +66,7 @@ def _parse_endpoint(endpoint):
         parsed_url = urlparse(endpoint)
         return {"secure": parsed_url.scheme == "https", "endpoint": parsed_url.netloc}
     else:
-        raise f"The configured storage endpoint is not a valid url: {endpoint}"
+        raise Exception(f"The configured storage endpoint is not a valid url: {endpoint}")
 
 
 def get_s3_storage(config: Config):