diff --git a/Library/Homebrew/cask/audit.rb b/Library/Homebrew/cask/audit.rb
index 2a16181322..6322db89e8 100644
--- a/Library/Homebrew/cask/audit.rb
+++ b/Library/Homebrew/cask/audit.rb
@@ -582,8 +582,11 @@ module Cask
 
       return if cask_min_os == min_os_string
 
-      min_os_symbol = cask_min_os&.to_sym.inspect
-      min_os_symbol = "no minimum OS version" if min_os_symbol == "nil"
+      min_os_symbol = if cask_min_os.present?
+        cask_min_os.to_sym.inspect
+      else
+        "no minimum OS version"
+      end
       add_error "Upstream defined #{min_os_string.to_sym.inspect} as the minimum OS version " \
                 "and the cask defined #{min_os_symbol}"
     end