diff --git a/Formula/isl@0.11.rb b/Formula/isl@0.11.rb
index 0943610fad..d56f383bc5 100644
--- a/Formula/isl@0.11.rb
+++ b/Formula/isl@0.11.rb
@@ -13,7 +13,7 @@ class IslAT011 < Formula
     sha256 "2f169ec06b1bf91a7ce2ca96438acea4498aa746c5c8b9e2a2deeca02f7187cc" => :yosemite
   end
 
-  keg_only "Older version of isl"
+  keg_only :versioned_formula
 
   depends_on "gmp@4"