diff --git a/midas/generator/generator.py b/midas/generator/generator.py
index b31164a..52c2d76 100644
--- a/midas/generator/generator.py
+++ b/midas/generator/generator.py
@@ -78,6 +78,9 @@ class Generator(p.Stmt.Visitor[ast.stmt], p.Expr.Visitor[ast.expr]):
         self._typed_ast = typed_ast
         body: list[ast.stmt] = self._visit_body(typed_ast.stmts, can_be_empty=True)
         predicates: list[ast.stmt] = self._constraint_generator.get_definitions()
+        assertion_definitions: list[ast.stmt] = list(
+            typed_ast.assertions.definitions.values()
+        )
 
         body = predicates + body
 
@@ -87,6 +90,8 @@ class Generator(p.Stmt.Visitor[ast.stmt], p.Expr.Visitor[ast.expr]):
         if self.define_is_column:
             body = [self._is_column_definition()] + body
 
+        body = assertion_definitions + body
+
         module = ast.Module(body=body, type_ignores=[])
         module = ast.fix_missing_locations(module)
         return module
diff --git a/midas/generator/stubs.py b/midas/generator/stubs.py
index 7ddcb06..d42f3db 100644
--- a/midas/generator/stubs.py
+++ b/midas/generator/stubs.py
@@ -273,14 +273,11 @@ class StubsGenerator:
                     ),
                 )
 
-            case ColumnType(type=inner):
+            case ColumnType():
                 self.import_pandas = True
-                return ast.Subscript(
-                    value=ast.Attribute(
-                        value=ast.Name(id="pd"),
-                        attr="Series",
-                    ),
-                    slice=self.dump_type(inner),
+                return ast.Attribute(
+                    value=ast.Name(id="pd"),
+                    attr="Series",
                 )
 
             case DataFrameType():