diff --git a/typed_ast/conversions.py b/typed_ast/conversions.py
index 356df255..7ffa465b 100644
--- a/typed_ast/conversions.py
+++ b/typed_ast/conversions.py
@@ -218,7 +218,7 @@ def visit_Str(self, s):
         if isinstance(s.s, bytes):
             return ast3.Bytes(s.s)
         else:
-            return ast3.Str(s.s)
+            return ast3.Str(s.s, s.kind)
 
     def visit_Num(self, n):
         new = self.generic_visit(n)