diff --git a/third_party/3/typed_ast/ast27.pyi b/third_party/3/typed_ast/ast27.pyi
index ac775a02c..1a08798e0 100644
--- a/third_party/3/typed_ast/ast27.pyi
+++ b/third_party/3/typed_ast/ast27.pyi
@@ -246,6 +246,7 @@ class Num(expr):
 
 class Str(expr):
     s = ...  # type: bytes
+    kind = ...  # type: str
 
 class Attribute(expr):
     value = ...  # type: expr
diff --git a/third_party/3/typed_ast/ast3.pyi b/third_party/3/typed_ast/ast3.pyi
index 810c8a6b0..2e18242dc 100644
--- a/third_party/3/typed_ast/ast3.pyi
+++ b/third_party/3/typed_ast/ast3.pyi
@@ -264,6 +264,7 @@ class Num(expr):
 
 class Str(expr):
     s = ...  # type: str
+    kind = ...  # type: str
 
 class FormattedValue(expr):
     value = ...  # type: expr