diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 01b6e6b837..5bc9aaae9f 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1430,7 +1430,7 @@ class Formula
     @installed ||= racks.flat_map do |rack|
       begin
         Formulary.from_rack(rack)
-      rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
+      rescue
         []
       end
     end.uniq(&:name)