diff --git a/stdlib/3/_thread.pyi b/stdlib/3/_thread.pyi
index 051edefbb..56f343b5a 100644
--- a/stdlib/3/_thread.pyi
+++ b/stdlib/3/_thread.pyi
@@ -30,7 +30,7 @@ def allocate_lock() -> LockType: ...
 def get_ident() -> int: ...
 def stack_size(size: int = ...) -> int: ...
 
-TIMEOUT_MAX: int
+TIMEOUT_MAX: float
 
 if sys.version_info >= (3, 8):
     def get_native_id() -> int: ...  # only available on some platforms