diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index db1b4bfed..c907d29ee 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -48,7 +48,7 @@ have specific features that you regularly develop against.
 ```sh
 #!/bin/sh
 
-cargo +nightly fmt -- --check || exit 1
+cargo +nightly fmt --all -- --check || exit 1
 cargo check --locked --all --all-targets --tests || exit 1
 cargo clippy --locked --all --all-targets --tests -- -D warnings || exit 1
 ```