diff --git a/stdlib/3/heapq.pyi b/stdlib/3/heapq.pyi
index 0894f983c..81b6135e8 100644
--- a/stdlib/3/heapq.pyi
+++ b/stdlib/3/heapq.pyi
@@ -2,6 +2,7 @@
 
 # Based on http://docs.python.org/3.2/library/heapq.html
 
+import sys
 from typing import TypeVar, List, Iterable, Any, Callable
 
 _T = TypeVar('_T')
@@ -11,7 +12,11 @@ def heappop(heap: List[_T]) -> _T: ...
 def heappushpop(heap: List[_T], item: _T) -> _T: ...
 def heapify(x: List[_T]) -> None: ...
 def heapreplace(heap: List[_T], item: _T) -> _T: ...
-def merge(*iterables: Iterable[_T]) -> Iterable[_T]: ...
+if sys.version_info >= (3, 5):
+    def merge(*iterables: Iterable[_T], key: Callable[[_T], Any] = ...,
+              reverse: bool = ...) -> Iterable[_T]: ...
+else:
+    def merge(*iterables: Iterable[_T]) -> Iterable[_T]: ...  # type: ignore
 def nlargest(n: int, iterable: Iterable[_T],
              key: Callable[[_T], Any] = ...) -> List[_T]: ...
 def nsmallest(n: int, iterable: Iterable[_T],