diff --git a/stdlib/3/_bootlocale.pyi b/stdlib/3/_bootlocale.pyi
new file mode 100644
index 000000000..a29c066eb
--- /dev/null
+++ b/stdlib/3/_bootlocale.pyi
@@ -0,0 +1,2 @@
+
+def getpreferredencoding(do_setlocale: bool = ...) -> str: ...