diff --git a/src/fastmcp/server/server.py b/src/fastmcp/server/server.py
index 2ec709bde..a22af3d26 100644
--- a/src/fastmcp/server/server.py
+++ b/src/fastmcp/server/server.py
@@ -768,7 +768,7 @@ class FastMCP(Generic[LifespanResultT]):
         def decorator(fn: AnyFunction) -> Resource | ResourceTemplate:
             from fastmcp.server.context import Context
 
-            if isinstance(fn, classmethod):
+            if isinstance(fn, classmethod):  # type: ignore[reportUnnecessaryIsInstance]
                 raise ValueError(
                     inspect.cleandoc(
                         """