diff --git a/ext/standard/crypt.c b/ext/standard/crypt.c
--- a/ext/standard/crypt.c
+++ b/ext/standard/crypt.c
@@ -151,6 +151,7 @@ PHPAPI zend_string *php_crypt(const char *password, const int pass_len, const ch
 		} else if (
 				salt[0] == '$' &&
 				salt[1] == '2' &&
+				salt[2] != 0 &&
 				salt[3] == '$') {
 			char output[PHP_MAX_SALT_LEN + 1];