diff --git a/debian/frr.postinst b/debian/frr.postinst
index 4e23cd3cec..eb9ec67dd9 100644
--- a/debian/frr.postinst
+++ b/debian/frr.postinst
@@ -40,7 +40,7 @@ find \
 	# don't chown anything that has ACLs (but don't fail if we don't
 	# have getfacl)
 	if { getfacl -c "$filename" 2>/dev/null || true; } \
-		| egrep -q -v '^((user|group|other)::|$)'; then
+		| grep -E -q -v '^((user|group|other)::|$)'; then
 		:
 	else
 		chown frr: "$filename"