diff --git a/Library/Homebrew/completions.rb b/Library/Homebrew/completions.rb
index af795741cb4651..69cd8b42a0eff7 100644
--- a/Library/Homebrew/completions.rb
+++ b/Library/Homebrew/completions.rb
@@ -265,10 +265,10 @@ def self.generate_zsh_subcommand_completion(command)
     end
 
     def self.generate_zsh_option_exclusions(command, option)
-      conflicts = Commands.option_conflicts(command, option.gsub(/^--/, ""))
+      conflicts = Commands.option_conflicts(command, option.gsub(/^--?/, ""))
       return "" unless conflicts.presence
 
-      "(#{conflicts.map { |conflict| "--#{conflict}" }.join(" ")})"
+      "(#{conflicts.map { |conflict| "-#{"-" if conflict.size > 1}#{conflict}" }.join(" ")})"
     end
 
     sig { params(commands: T::Array[String]).returns(String) }