diff --git a/create.sh b/create.sh
index 7cd4f94..8186198 100755
--- a/create.sh
+++ b/create.sh
@@ -43,9 +43,9 @@ docker exec --user www-data $PREFIX-web /bin/sh -c '
         --force \
         --path=/var/www/html \
         --skip-check \
-        --extra-php <<PHP
+        --extra-php <<EXTRA-PHP
 if (isset(\$_SERVER["HTTP_X_FORWARDED_PROTO"]) && \$_SERVER["HTTP_X_FORWARDED_PROTO"] == "https") \$_SERVER["HTTPS"]="on";
-PHP
+EXTRA-PHP
 '
 docker exec --user www-data $PREFIX-web /bin/sh -c "
     wp core install \