diff --git a/src/doc/rustc-dev-guide/src/implementing_new_features.md b/src/doc/rustc-dev-guide/src/implementing_new_features.md
index c77b872cf5c1..fda38ef4fc01 100644
--- a/src/doc/rustc-dev-guide/src/implementing_new_features.md
+++ b/src/doc/rustc-dev-guide/src/implementing_new_features.md
@@ -167,7 +167,7 @@ a new unstable feature:
 
 1. Prevent usage of the new feature unless the feature gate is set.
    You can check it in most places in the compiler using the
-   expression `tcx.features().$feature_name`
+   expression `tcx.features().$feature_name()`
 
     If the feature gate is not set, you should either maintain
     the pre-feature behavior or raise an error, depending on