diff --git a/sqlalchemy_utils/types/ts_vector.py b/sqlalchemy_utils/types/ts_vector.py
index 793e6e5f..11845a16 100644
--- a/sqlalchemy_utils/types/ts_vector.py
+++ b/sqlalchemy_utils/types/ts_vector.py
@@ -84,6 +84,10 @@ class Article(Base):
     impl = TSVECTOR
     cache_ok = True
 
+    @property
+    def python_type(self) -> type[str]:
+        return str
+    
     class comparator_factory(TSVECTOR.Comparator):
         def match(self, other, **kwargs):
             if 'postgresql_regconfig' not in kwargs:
@@ -105,4 +109,4 @@ def __init__(self, *args, **kwargs):
         """
         self.columns = args
         self.options = kwargs
-        super().__init__()
+        super().__init__()
\ No newline at end of file