diff --git a/mod/install.php b/mod/install.php
index 4b4940d277..049642b92c 100644
--- a/mod/install.php
+++ b/mod/install.php
@@ -397,7 +397,8 @@ function check_funcs(&$checks) {
 	check_add($ck_funcs, L10n::t('PDO or MySQLi PHP module'), true, true, "");
 	check_add($ck_funcs, L10n::t('mb_string PHP module'), true, true, "");
 	check_add($ck_funcs, L10n::t('XML PHP module'), true, true, "");
-	check_add($ck_funcs, L10n::t('iconv module'), true, true, "");
+	check_add($ck_funcs, L10n::t('iconv PHP module'), true, true, "");
+	check_add($ck_funcs, L10n::t('POSIX PHP module'), true, true, "");
 
 	if (function_exists('apache_get_modules')) {
 		if (! in_array('mod_rewrite',apache_get_modules())) {
@@ -435,6 +436,10 @@ function check_funcs(&$checks) {
 		$ck_funcs[7]['status'] = false;
 		$ck_funcs[7]['help'] = L10n::t('Error: iconv PHP module required but not installed.');
 	}
+	if (! function_exists('posix_kill')) {
+		$ck_funcs[8]['status'] = false;
+		$ck_funcs[0]['help'] = L10n::t('Error: POSIX PHP module required but not installed.');
+	}
 
 	$checks = array_merge($checks, $ck_funcs);