diff --git a/Library/Homebrew/cmd/info.rb b/Library/Homebrew/cmd/info.rb
index cff34530b..021f48f42 100644
--- a/Library/Homebrew/cmd/info.rb
+++ b/Library/Homebrew/cmd/info.rb
@@ -240,7 +240,7 @@ module Homebrew
   def github_info(f)
     return f.path if f.tap.blank? || f.tap.remote.blank?
 
-    path = if f.class.superclass == Formula
+    path = if f.is_a?(Formula)
       f.path.relative_path_from(f.tap.path)
     elsif f.is_a?(Cask::Cask)
       f.sourcefile_path.relative_path_from(f.tap.path)