diff --git a/lib/interac_email.rb b/lib/interac_email.rb
index a25804d52f677ce11b457b5e828c9e48f27dd13a..1b06d370785e775de690fa49c48ba934df8f9071 100644
--- a/lib/interac_email.rb
+++ b/lib/interac_email.rb
@@ -143,8 +143,9 @@ class InteracEmail
 		def dkim_headers
 			# Apparently there can sometimes be multiple DKIM sigs
 			# And this library returns a scalar if there's one, or array otherwise
-			[@m["DKIM-Signature"]].flatten.compact.map { |h|
-				h.value
+			# This Array method, when passed `nil` even returns an emtpy list!
+			Array(@m["DKIM-Signature"]).map { |s|
+				s.value
 				&.split(/;\s*/)
 				&.each_with_object({}) { |f, h|
 					k, v = f.split("=", 2)