diff --git a/Formula/imagemagick@6.rb b/Formula/imagemagick@6.rb
index 3416cb3b41..5c9d040ec1 100644
--- a/Formula/imagemagick@6.rb
+++ b/Formula/imagemagick@6.rb
@@ -14,7 +14,7 @@ class ImagemagickAT6 < Formula
     sha256 "8af8736c27512fe4689f9d1221b5a5d1babd1777d4f80ab551e8c05c0de42c09" => :yosemite
   end
 
-  keg_only "Older version of imagemagick"
+  keg_only :versioned_formula
 
   option "with-fftw", "Compile with FFTW support"
   option "with-hdri", "Compile with HDRI support"