diff --git a/Library/Homebrew/api/bottle.rb b/Library/Homebrew/api/bottle.rb
index 49aabcc8b7..fa547ad485 100644
--- a/Library/Homebrew/api/bottle.rb
+++ b/Library/Homebrew/api/bottle.rb
@@ -66,7 +66,7 @@ module Homebrew
           match[:sha256]
         end
 
-        sig { params(hash: Hash, tag: Symbol).void }
+        sig { params(hash: Hash, tag: String).void }
         def download_bottle(hash, tag)
           bottle = hash["bottles"][tag]
           bottle ||= hash["bottles"]["all"]