diff --git a/titan/resources/grant.py b/titan/resources/grant.py
index 0406299..d90bec9 100644
--- a/titan/resources/grant.py
+++ b/titan/resources/grant.py
@@ -457,6 +457,8 @@ def __post_init__(self):
         super().__post_init__()
         if self.in_type not in [ResourceType.DATABASE, ResourceType.SCHEMA]:
             raise ValueError(f"in_type must be either DATABASE or SCHEMA, not {self.in_type}")
+        if isinstance(self.priv, str):
+            self.priv = self.priv.upper()
         self.to_type = self.to.resource_type