diff --git a/crates/ra_cli/Cargo.toml b/crates/ra_cli/Cargo.toml
index 5e7bf3ed45..0b8d6f3dd8 100644
--- a/crates/ra_cli/Cargo.toml
+++ b/crates/ra_cli/Cargo.toml
@@ -1,4 +1,5 @@
 [package]
+edition = "2018"
 name = "ra_cli"
 version = "0.1.0"
 authors = ["Aleksey Kladov <aleksey.kladov@gmail.com>"]