diff --git a/lib/ldap.c b/lib/ldap.c
index 6733ef46b3..62a9ffc196 100644
--- a/lib/ldap.c
+++ b/lib/ldap.c
@@ -140,6 +140,7 @@ const struct Curl_handler Curl_handler_ldap = {
   ZERO_NULL,                            /* doing_getsock */
   ZERO_NULL,                            /* perform_getsock */
   ZERO_NULL,                            /* disconnect */
+  ZERO_NULL,                            /* readwrite */
   PORT_LDAP,                            /* defport */
   CURLPROTO_LDAP,                       /* protocol */
   PROTOPT_NONE                          /* flags */
@@ -163,6 +164,7 @@ const struct Curl_handler Curl_handler_ldaps = {
   ZERO_NULL,                            /* doing_getsock */
   ZERO_NULL,                            /* perform_getsock */
   ZERO_NULL,                            /* disconnect */
+  ZERO_NULL,                            /* readwrite */
   PORT_LDAPS,                           /* defport */
   CURLPROTO_LDAP | CURLPROTO_LDAPS,     /* protocol */
   PROTOPT_SSL                           /* flags */