diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 54ea1997a331..3725d203e563 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -131,7 +131,7 @@ To run rustfmt tests locally:
 
 3. Run clippy using cargo from the root of your diesel repo.
    ```
-   cargo clippy
+   cargo clippy --all
    ```
    Each PR needs to compile without warning.