diff --git a/src/flake8/processor.py b/src/flake8/processor.py
index 6b7d3c4..4b96205 100644
--- a/src/flake8/processor.py
+++ b/src/flake8/processor.py
@@ -218,7 +218,7 @@ class FileProcessor:
             (previous_row, previous_column) = end
         return comments, logical, mapping
 
-    def build_ast(self) -> ast.AST:
+    def build_ast(self) -> ast.Module:
         """Build an abstract syntax tree from the list of lines."""
         return ast.parse("".join(self.lines))