diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 460ed549be92..48fbdd29e969 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -1317,7 +1317,7 @@ def get_dependencies_recurse(self, result: OrderedSet[BuildTargetTypes], include
     def get_source_subdir(self):
         return self.subdir
 
-    def get_sources(self):
+    def get_sources(self) -> T.List[File]:
         return self.sources
 
     def get_objects(self) -> T.List[T.Union[str, 'File', 'ExtractedObjects']]:
@@ -2510,7 +2510,7 @@ def __init__(self, shared: SharedLibrary, static: StaticLibrary, preferred_libra
     def __repr__(self) -> str:
         return f'<BothLibraries: static={repr(self.static)}; shared={repr(self.shared)}>'
 
-    def get(self, lib_type: T.Literal['static', 'shared', 'auto']) -> LibTypes:
+    def get(self, lib_type: T.Literal['static', 'shared', 'auto']) -> T.Union[StaticLibrary, SharedLibrary]:
         if lib_type == 'static':
             return self.static
         if lib_type == 'shared':