diff --git a/Library/Homebrew/cmd/leaves.rb b/Library/Homebrew/cmd/leaves.rb
index ffc8351ef6..192f8a90c1 100644
--- a/Library/Homebrew/cmd/leaves.rb
+++ b/Library/Homebrew/cmd/leaves.rb
@@ -37,8 +37,8 @@ module Homebrew
 
     leaves_list = Formula.installed_formulae_with_no_dependents
 
-    leaves_list.select!(&:installed_on_request?) if args.installed_on_request?
-    leaves_list.select!(&:installed_as_dependency?) if args.installed_as_dependency?
+    leaves_list.select!(&method(:installed_on_request?)) if args.installed_on_request?
+    leaves_list.select!(&method(:installed_as_dependency?)) if args.installed_as_dependency?
 
     leaves_list.map(&:full_name)
                .sort