diff --git a/src/librustpkg/lib.rs b/src/librustpkg/lib.rs
index 538865acfb50..27d3a3e549a8 100644
--- a/src/librustpkg/lib.rs
+++ b/src/librustpkg/lib.rs
@@ -384,7 +384,7 @@ impl CtxMethods for BuildContext {
             }
             PreferCmd => {
                 if args.len() < 1 {
-                    return usage::uninstall();
+                    return usage::prefer();
                 }
 
                 self.prefer(args[0], None);