diff --git a/packages/antlion/typing.py b/packages/antlion/typing.py
index 435c68d..24f1a0e 100644
--- a/packages/antlion/typing.py
+++ b/packages/antlion/typing.py
@@ -22,6 +22,8 @@
 
 class StrEnum(str, Enum):
     def __str__(self) -> str:
+        if not isinstance(self.value, str):
+            raise TypeError(f"Expected a str, got {type(self.value)}")
         return self.value
 
     @classmethod