diff --git a/scripts/lint-doc.sh b/scripts/lint-doc.sh
index 7c4e82769029dcf09b7c4a642d6c8d0822f780c1..62236ed539af61e08cb5ed317381aa006be525c0 100755
--- a/scripts/lint-doc.sh
+++ b/scripts/lint-doc.sh
@@ -3,7 +3,7 @@
 cd "$(dirname "$0")/.."
 
 # Use long options (e.g. --header instead of -H) for curl examples in documentation.
-grep --perl-regexp --recursive --color=auto 'curl (.+ )?-[^- ].*' doc/
+grep --extended-regexp --recursive --color=auto 'curl (.+ )?-[^- ].*' doc/
 if [ $? == 0 ]
 then
   echo '✖ ERROR: Short options should not be used in documentation!' >&2