diff --git a/stdlib/2and3/threading.pyi b/stdlib/2and3/threading.pyi
index eb89a2749..efd941fbd 100644
--- a/stdlib/2and3/threading.pyi
+++ b/stdlib/2and3/threading.pyi
@@ -35,7 +35,7 @@ def setprofile(func: _PF) -> None: ...
 def stack_size(size: int = ...) -> int: ...
 
 if sys.version_info >= (3,):
-    TIMEOUT_MAX = ...  # type: int
+    TIMEOUT_MAX = ...  # type: float
 
 class ThreadError(Exception): ...
 
@@ -86,7 +86,7 @@ class Lock:
                  exc_val: Optional[Exception],
                  exc_tb: Optional[TracebackType]) -> bool: ...
     if sys.version_info >= (3,):
-        def acquire(self, blocking: bool = ..., timeout: int = ...) -> bool: ...
+        def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
     else:
         def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
@@ -100,7 +100,7 @@ class _RLock:
                  exc_val: Optional[Exception],
                  exc_tb: Optional[TracebackType]) -> bool: ...
     if sys.version_info >= (3,):
-        def acquire(self, blocking: bool = ..., timeout: int = ...) -> bool: ...
+        def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
     else:
         def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
@@ -116,7 +116,7 @@ class Condition:
                  exc_val: Optional[Exception],
                  exc_tb: Optional[TracebackType]) -> bool: ...
     if sys.version_info >= (3,):
-        def acquire(self, blocking: bool = ..., timeout: int = ...) -> bool: ...
+        def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
     else:
         def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
@@ -136,7 +136,7 @@ class Semaphore:
                  exc_val: Optional[Exception],
                  exc_tb: Optional[TracebackType]) -> bool: ...
     if sys.version_info >= (3,):
-        def acquire(self, blocking: bool = ..., timeout: int = ...) -> bool: ...
+        def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
     else:
         def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...
@@ -148,7 +148,7 @@ class BoundedSemaphore:
                  exc_val: Optional[Exception],
                  exc_tb: Optional[TracebackType]) -> bool: ...
     if sys.version_info >= (3,):
-        def acquire(self, blocking: bool = ..., timeout: int = ...) -> bool: ...
+        def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
     else:
         def acquire(self, blocking: bool = ...) -> bool: ...
     def release(self) -> None: ...