diff --git a/ext/ldap/ldap.c b/ext/ldap/ldap.c
index a040a0d38c39a..5d47fb662407e 100644
--- a/ext/ldap/ldap.c
+++ b/ext/ldap/ldap.c
@@ -2001,6 +2001,8 @@ PHP_FUNCTION(ldap_sort)
 	size_t sflen;
 	zend_resource *le;
 
+    php_error_docref(NULL, E_DEPRECATED, "Usage of ldap_sort is deprecated and will be removed in one of the next PHP-versions");
+
 	if (zend_parse_parameters(ZEND_NUM_ARGS(), "rrs", &link, &result, &sortfilter, &sflen) != SUCCESS) {
 		RETURN_FALSE;
 	}