diff --git a/reflex/utils/exceptions.py b/reflex/utils/exceptions.py
index d35643753..46fae0e4d 100644
--- a/reflex/utils/exceptions.py
+++ b/reflex/utils/exceptions.py
@@ -78,7 +78,7 @@ class VarAttributeError(ReflexError, AttributeError):
 class UntypedComputedVarError(ReflexError, TypeError):
     """Custom TypeError for untyped computed var errors."""
 
-    def __init__(self, var_name):
+    def __init__(self, var_name: str):
         """Initialize the UntypedComputedVarError.
 
         Args:
@@ -90,7 +90,7 @@ class UntypedComputedVarError(ReflexError, TypeError):
 class MissingAnnotationError(ReflexError, TypeError):
     """Custom TypeError for missing annotations."""
 
-    def __init__(self, var_name):
+    def __init__(self, var_name: str):
         """Initialize the MissingAnnotationError.
 
         Args: