diff --git a/cups-filters-execmem.patch b/cups-filters-execmem.patch
index 2c95bfd..60518c2 100644
--- a/cups-filters-execmem.patch
+++ b/cups-filters-execmem.patch
@@ -6,7 +6,7 @@ diff -up cups-filters-1.0.53/filter/pstopdf.execmem cups-filters-1.0.53/filter/p
  eval "$(printf "%s" "$5" | sed -nre 's/.*(^|\s)orientation-requested=5.*/orientation="${orientation:-270}"/p')"
  eval "$(printf "%s" "$5" | sed -nre 's/.*(^|\s)orientation-requested=6.*/orientation="${orientation:-180}"/p')"
 -if printf "%s" "$5" | grep -iPq '(\s|^)landscape(=(1|on|yes|true))?(\s|$)'; then
-+if printf "%s" "$5" | grep -iq '(\s|^)landscape(=(1|on|yes|true))?(\s|$)'; then
++if printf "%s" "$5" | grep -qiE '(\s|^)landscape(=(1|on|yes|true))?(\s|$)'; then
      if test -e "$PPD"; then
  	eval "$(sed -nre 's/^\*LandscapeOrientation:\s*Plus90.*/orientation="${orientation:-90}"/p' "$PPD")"
  	eval "$(sed -nre 's/^\*LandscapeOrientation:\s*Minus90.*/orientation="${orientation:-270}"/p' "$PPD")"