--- /usr/sbin/etc-update	2015-10-07 23:49:58.000000000 +0200
+++ /usr/sbin/etc-update	2017-01-30 08:21:19.559591032 +0100
@@ -649,7 +649,7 @@ 
 		elif [[ -L ${efile} || -L ${file} ]] ; then
 			# not the same file types
 			continue
-		elif diff_command "${file}" "${efile}" &> /dev/null; then
+		elif diff -uN "${file}" "${efile}" &> /dev/null; then
 			# replace identical copy
 			mv "${file}" "${efile}"
 			break