diff --git a/Library/Homebrew/cask/audit.rb b/Library/Homebrew/cask/audit.rb
index b9465c276f..5bddd455b8 100644
--- a/Library/Homebrew/cask/audit.rb
+++ b/Library/Homebrew/cask/audit.rb
@@ -585,7 +585,7 @@ module Cask
           next if result.success?
 
           # Only fail if signature is wrong, not when no signature is present at all.
-          next result.stderr.include?("not signed at all")
+          next if result.stderr.include?("not signed at all")
 
           add_warning "Signature verification failed: #{result.merged_output}"
         end