diff --git a/stdlib/3/subprocess.pyi b/stdlib/3/subprocess.pyi
index 43934b5ef..9de5bf4c0 100644
--- a/stdlib/3/subprocess.pyi
+++ b/stdlib/3/subprocess.pyi
@@ -2,6 +2,7 @@
 
 # Based on http://docs.python.org/3.2/library/subprocess.html
 
+import sys
 from typing import Sequence, Any, Mapping, Callable, Tuple, IO, Optional, Union
 
 # Same args as Popen.__init__
@@ -101,7 +102,10 @@ class Popen:
     def poll(self) -> int: ...
     def wait(self) -> int: ...
     # Return str/bytes
-    def communicate(self, input=...) -> Tuple[Any, Any]: ...
+    if sys.version_info >= (3, 3):
+        def communicate(self, input=..., timeout: float = ...) -> Tuple[Any, Any]: ...
+    else:
+        def communicate(self, input=...) -> Tuple[Any, Any]: ...
     def send_signal(self, signal: int) -> None: ...
     def terminate(self) -> None: ...
     def kill(self) -> None: ...