diff --git a/stdlib/3/datetime.pyi b/stdlib/3/datetime.pyi
index df7ed9f69..c204bedca 100644
--- a/stdlib/3/datetime.pyi
+++ b/stdlib/3/datetime.pyi
@@ -175,7 +175,7 @@ class datetime:
     def tzinfo(self) -> Optional[_tzinfo]: ...
 
     @classmethod
-    def fromtimestamp(cls, t: float, tz: Optional[timezone] = ...) -> datetime: ...
+    def fromtimestamp(cls, t: float, tz: Optional[_tzinfo] = ...) -> datetime: ...
     @classmethod
     def utcfromtimestamp(cls, t: float) -> datetime: ...
     @classmethod