diff --git a/testlib/src/main/resources/scala/scalafmt/scalafmt.fileoverride.conf b/testlib/src/main/resources/scala/scalafmt/scalafmt.fileoverride.conf
new file mode 100644
index 0000000000..e4bd1f3a44
--- /dev/null
+++ b/testlib/src/main/resources/scala/scalafmt/scalafmt.fileoverride.conf
@@ -0,0 +1,9 @@
+version = 3.7.3
+runner.dialect = scala213
+style = defaultWithAlign # For pretty alignment.
+maxColumn = 200          # For my mega-wide display
+fileOverride {
+  "glob:**/scala/scalafmt/**" {
+    maxColumn = 20           # For my teensy narrow display
+  }
+}