diff --git a/xpublish_wms/grid.py b/xpublish_wms/grid.py
index 6f3c9b9..4cca298 100644
--- a/xpublish_wms/grid.py
+++ b/xpublish_wms/grid.py
@@ -12,7 +12,7 @@ class GridType(Enum):
 
     @classmethod
     def from_ds(cls, ds: xr.Dataset):
-        if "grid" in ds.cf.cf_roles["grid_topology"]:
+        if "grid_topology" in ds.cf.cf_roles:
             return cls.SGRID
 
         try: