diff --git a/stdlib/2.7/datetime.pyi b/stdlib/2.7/datetime.pyi
index 30651f2bf..ef4f9a622 100644
--- a/stdlib/2.7/datetime.pyi
+++ b/stdlib/2.7/datetime.pyi
@@ -10,8 +10,8 @@ MAXYEAR = 0
 
 class tzinfo(object):
     def tzname(self, dt: Optional[datetime]) -> str: ...
-    def utcoffset(self, dt: Optional[datetime]) -> timedelta: ...
-    def dst(self, dt: Optional[datetime]) -> timedelta: ...
+    def utcoffset(self, dt: Optional[datetime]) -> Optional[timedelta]: ...
+    def dst(self, dt: Optional[datetime]) -> Optional[timedelta]: ...
     def fromutc(self, dt: datetime) -> datetime: ...
 
 class timezone(tzinfo):
diff --git a/stdlib/3/datetime.pyi b/stdlib/3/datetime.pyi
index 6e0294f8a..dd161a5f9 100644
--- a/stdlib/3/datetime.pyi
+++ b/stdlib/3/datetime.pyi
@@ -9,8 +9,8 @@ MAXYEAR = 0
 
 class tzinfo:
     def tzname(self, dt: Optional[datetime]) -> str: ...
-    def utcoffset(self, dt: Optional[datetime]) -> int: ...
-    def dst(self, dt: Optional[datetime]) -> int: ...
+    def utcoffset(self, dt: Optional[datetime]) -> Optional[timedelta]: ...
+    def dst(self, dt: Optional[datetime]) -> Optional[timedelta]: ...
     def fromutc(self, dt: datetime) -> datetime: ...
 
 class timezone(tzinfo):