diff --git a/vagrant/after.sh b/vagrant/after.sh
index 9526698593..909d2d51f7 100755
--- a/vagrant/after.sh
+++ b/vagrant/after.sh
@@ -32,7 +32,13 @@ then
 fi
 
 # Add DEBUG mode to phpBB to remove annoying installer warnings
-sed -i "$ a @define('DEBUG', true);" ${PHPBB_CONFIG}
+echo "@define('DEBUG', true);" >> ${PHPBB_CONFIG}
+
+# Change environment to development
+sed -i '/^.*PHPBB_ENVIRONMENT.*$/s/production/development/' ${PHPBB_CONFIG}
+
+# Display load time
+sed -i '/^.*PHPBB_DISPLAY_LOAD_TIME.*$/s/^\/\/[[:blank:]]*//' ${PHPBB_CONFIG}
 
 # Update the PHP memory limits (enough to allow phpunit tests to run)
 sed -i "s/memory_limit = .*/memory_limit = 1024M/" /etc/php/7.1/fpm/php.ini