diff --git a/.scalafmt.conf b/.scalafmt.conf
index 40e0dee07..033c4e792 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,4 +1,5 @@
 version = 3.0.6
+runner.dialect = scala213source3
 project.git = true
 style = Scala.js
 project.includeFilters = ["src/main/scala/org/scalajs/.*\\.scala"]