diff --git a/Library/Homebrew/cli/named_args.rb b/Library/Homebrew/cli/named_args.rb
index e26a8d15f0..c6f6f60976 100644
--- a/Library/Homebrew/cli/named_args.rb
+++ b/Library/Homebrew/cli/named_args.rb
@@ -140,7 +140,8 @@ module Homebrew
               warn_if_cask_conflicts(name, "formula") if only != :formula
               return formula
             rescue FormulaUnreadableError, FormulaClassUnavailableError,
-                   TapFormulaUnreadableError, TapFormulaClassUnavailableError => e
+                   TapFormulaUnreadableError, TapFormulaClassUnavailableError,
+                   FormulaSpecificationError => e
               # Need to rescue before `FormulaUnavailableError` (superclass of this)
               # The formula was found, but there's a problem with its implementation
               unreadable_error ||= e
diff --git a/Library/Homebrew/cli/parser.rb b/Library/Homebrew/cli/parser.rb
index c667283ac0..993df1a3e8 100644
--- a/Library/Homebrew/cli/parser.rb
+++ b/Library/Homebrew/cli/parser.rb
@@ -653,7 +653,7 @@ module Homebrew
 
           begin
             Formulary.factory(arg, spec, flags: argv.select { |a| a.start_with?("--") })
-          rescue FormulaUnavailableError
+          rescue FormulaUnavailableError, FormulaSpecificationError
             nil
           end
         end.compact.uniq(&:name)