diff --git a/construct-stubs/core.pyi b/construct-stubs/core.pyi
index 23d9c43..34aaf79 100644
--- a/construct-stubs/core.pyi
+++ b/construct-stubs/core.pyi
@@ -105,10 +105,10 @@ class Construct(t.Generic[ParsedType, BuildTypes]):
     def build(self, obj: BuildTypes, **contextkw: ContextKWType) -> bytes: ...
     def build_stream(
         self, obj: BuildTypes, stream: StreamType, **contextkw: ContextKWType
-    ) -> bytes: ...
+    ) -> None: ...
     def build_file(
         self, obj: BuildTypes, filename: FilenameType, **contextkw: ContextKWType
-    ) -> bytes: ...
+    ) -> None: ...
     def sizeof(self, **contextkw: ContextKWType) -> int: ...
     def compile(
         self, filename: FilenameType = ...