diff --git a/pins/rsconnect/fs.py b/pins/rsconnect/fs.py
index 853443a..3cae84b 100644
--- a/pins/rsconnect/fs.py
+++ b/pins/rsconnect/fs.py
@@ -1,6 +1,6 @@
 from dataclasses import asdict, dataclass, field, fields
 from pathlib import Path
-from typing import Sequence
+from typing import ClassVar, Sequence
 
 from fsspec import AbstractFileSystem
 
@@ -105,7 +105,7 @@ class BundleFilePath(BundlePath):
 
 
 class RsConnectFs(AbstractFileSystem):
-    protocol: str = "rsc"
+    protocol: ClassVar[str | tuple[str, ...]] = "rsc"
 
     def __init__(self, server_url, **kwargs):
         if isinstance(server_url, RsConnectApi):
diff --git a/pyproject.toml b/pyproject.toml
index 3497c51..5ff445f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -104,7 +104,6 @@ reportAttributeAccessIssue = false
 reportCallIssue = false
 reportGeneralTypeIssues = false
 reportIncompatibleMethodOverride = false
-reportIncompatibleVariableOverride = false
 reportIndexIssue = false
 reportMissingImports = false
 reportMissingTypeStubs = false