diff --git a/include/sanity_check.php b/include/sanity_check.php
index 5c631574d..d77be4201 100644
--- a/include/sanity_check.php
+++ b/include/sanity_check.php
@@ -100,7 +100,11 @@
 		}
 
 		if (!function_exists("mb_strlen")) {
-			$err_msg = "PHP support for mbstring functions is required, but was not found.";
+			$err_msg = "PHP support for mbstring functions is required but was not found.";
+		}
+
+		if (!function_exists("hash")) {
+			$err_msg = "PHP support for hash() function is required but was not found.";
 		}
 
 		if (!function_exists("ctype_lower")) {