diff --git a/pkgs/build-support/upstream-updater/urls-from-page.sh b/pkgs/build-support/upstream-updater/urls-from-page.sh
index aecf645eb817..db39286ccb02 100755
--- a/pkgs/build-support/upstream-updater/urls-from-page.sh
+++ b/pkgs/build-support/upstream-updater/urls-from-page.sh
@@ -9,6 +9,6 @@ relpath="${path#$server}"
  
 echo "URL: $url" >&2
 
-curl -A 'text/html; text/xhtml; text/xml; */*' -L -k "$url" | sed -re 's/^/-/;s/[hH][rR][eE][fF]=("([^"]*)"|'\''([^'\'']*)'\''|([^"'\'' <>&]+)[ <>&])/\n+\2\3\4\n-/g' | \
+curl -A 'text/html; text/xhtml; text/xml; */*' -L -k "$url" | sed -re 's/^/-/;s/[^a-zA-Z][hH][rR][eE][fF]=("([^"]*)"|'\''([^'\'']*)'\''|([^"'\'' <>&]+)[ <>&])/\n+\2\3\4\n-/g' | \
   sed -e '/^-/d; s/^[+]//; /^#/d;'"s/^\\//$protocol:\\/\\/$server\\//g" | \
   sed -re 's`^[^:]*$`'"$protocol://$basepath/&\`"