diff --git a/stdlib/2/multiprocessing/__init__.pyi b/stdlib/2/multiprocessing/__init__.pyi
index 91754a3f1..c830c8b89 100644
--- a/stdlib/2/multiprocessing/__init__.pyi
+++ b/stdlib/2/multiprocessing/__init__.pyi
@@ -12,7 +12,7 @@ class AuthenticationError(ProcessError): ...
 
 def Manager(): ...
 def Pipe(duplex=True): ...
-def cpu_count(): ...
+def cpu_count() -> int: ...
 def freeze_support(): ...
 def get_logger(): ...
 def log_to_stderr(level=None): ...