diff --git a/.rustfmt.toml b/.rustfmt.toml
index a5f6e5a78..a05345e41 100644
--- a/.rustfmt.toml
+++ b/.rustfmt.toml
@@ -1,3 +1,4 @@
+edition = "2018"
 max_width = 100
 comment_width = 80
 wrap_comments = true