diff --git a/Casks/gpg-suite-no-mail.rb b/Casks/gpg-suite-no-mail.rb
index d66b9ceacec..f6ab591682f 100644
--- a/Casks/gpg-suite-no-mail.rb
+++ b/Casks/gpg-suite-no-mail.rb
@@ -12,10 +12,10 @@ cask "gpg-suite-no-mail" do
   end
 
   auto_updates true
-  conflicts_with cask: %w[
-    gpg-suite
-    gpg-suite-pinentry
-    homebrew/cask-versions/gpg-suite-nightly
+  conflicts_with cask: [
+    "gpg-suite",
+    "gpg-suite-pinentry",
+    "homebrew/cask-versions/gpg-suite-nightly",
   ], formula: "gpg"
   depends_on macos: ">= :mojave"