diff --git a/curl-helper.c b/curl-helper.c
index b749170..ff28a40 100644
--- a/curl-helper.c
+++ b/curl-helper.c
@@ -105,7 +105,7 @@ typedef enum OcamlValues
     Ocaml_IOCTLFUNCTION,
     Ocaml_SEEKFUNCTION,
     Ocaml_OPENSOCKETFUNCTION,
-    Ocaml_CLOSESOCKETFUNCTION,
+    /* Ocaml_CLOSESOCKETFUNCTION, */
     Ocaml_SSH_KEYFUNCTION,
 
     Ocaml_ERRORBUFFER,
@@ -1183,6 +1183,7 @@ static int cb_OPENSOCKETFUNCTION(void *data,
     return ((sock == -1) ? CURL_SOCKET_BAD : sock);
 }
 
+/*
 static int cb_CLOSESOCKETFUNCTION(void *data,
                          curl_socket_t socket)
 {
@@ -1203,6 +1204,7 @@ static int cb_CLOSESOCKETFUNCTION(void *data,
     caml_enter_blocking_section();
     return result;
 }
+*/
 
 static int cb_SSH_KEYFUNCTION(CURL *easy,
                               const struct curl_khkey *knownkey,
@@ -1575,7 +1577,7 @@ SETOPT_FUNCTION( IOCTL)
 #endif
 
 SETOPT_FUNCTION( OPENSOCKET)
-SETOPT_FUNCTION( CLOSESOCKET)
+/* SETOPT_FUNCTION( CLOSESOCKET) */
 
 static void handle_slist(Connection *conn, struct curl_slist** slist, CURLoption curl_option, value option)
 {
@@ -3612,7 +3614,7 @@ CURLOptionMapping implementedOptionMap[] =
   HAVENOT(AUTOREFERER),
 #endif
   HAVE(OPENSOCKETFUNCTION),
-  HAVE(CLOSESOCKETFUNCTION),
+  /*HAVE(CLOSESOCKETFUNCTION),*/
 #if HAVE_DECL_CURLOPT_PROXYTYPE
   HAVE(PROXYTYPE),
 #else
diff --git a/curl.ml b/curl.ml
index 02f4a3f..f7d1d54 100644
--- a/curl.ml
+++ b/curl.ml
@@ -470,7 +470,7 @@ type curlOption =
   | CURLOPT_SEEKFUNCTION of (int64 -> curlSeek -> curlSeekResult)
   | CURLOPT_AUTOREFERER of bool
   | CURLOPT_OPENSOCKETFUNCTION of (Unix.file_descr -> unit)
-  | CURLOPT_CLOSESOCKETFUNCTION of (Unix.file_descr -> unit)
+(*   | CURLOPT_CLOSESOCKETFUNCTION of (Unix.file_descr -> unit) *)
   | CURLOPT_PROXYTYPE of curlProxyType
   | CURLOPT_PROTOCOLS of curlProto list
   | CURLOPT_REDIR_PROTOCOLS of curlProto list
@@ -1019,8 +1019,10 @@ let set_autoreferer conn b =
 let set_opensocketfunction conn closure =
   setopt conn (CURLOPT_OPENSOCKETFUNCTION closure)
 
+(*
 let set_closesocketfunction conn closure =
   setopt conn (CURLOPT_CLOSESOCKETFUNCTION closure)
+*)
 
 let set_proxytype conn ptype =
   setopt conn (CURLOPT_PROXYTYPE ptype)
@@ -1427,7 +1429,7 @@ class handle =
     method set_dns_servers l = set_dns_servers conn l
     method set_autoreferer b = set_autoreferer conn b
     method set_opensocketfunction closure = set_opensocketfunction conn closure
-    method set_closesocketfunction closure = set_closesocketfunction conn closure
+(*     method set_closesocketfunction closure = set_closesocketfunction conn closure *)
     method set_proxytype t = set_proxytype conn t
     method set_mimepost p = set_mimepost conn p
     method set_sshknownhosts s = set_sshknownhosts conn s
diff --git a/curl.mli b/curl.mli
index 89b4a5b..2930e48 100644
--- a/curl.mli
+++ b/curl.mli
@@ -478,7 +478,7 @@ type curlOption =
   | CURLOPT_SEEKFUNCTION of (int64 -> curlSeek -> curlSeekResult)
   | CURLOPT_AUTOREFERER of bool
   | CURLOPT_OPENSOCKETFUNCTION of (Unix.file_descr -> unit)
-  | CURLOPT_CLOSESOCKETFUNCTION of (Unix.file_descr -> unit)
+(*   | CURLOPT_CLOSESOCKETFUNCTION of (Unix.file_descr -> unit) *)
   | CURLOPT_PROXYTYPE of curlProxyType
   | CURLOPT_PROTOCOLS of curlProto list
   | CURLOPT_REDIR_PROTOCOLS of curlProto list
@@ -790,7 +790,11 @@ val set_proxytransfermode : t -> bool -> unit
 val set_seekfunction : t -> (int64 -> curlSeek -> curlSeekResult) -> unit
 val set_autoreferer : t -> bool -> unit
 val set_opensocketfunction : t -> (Unix.file_descr -> unit) -> unit
+
+(** current implementation is faulty
+    ref https://github.com/ygrek/ocurl/issues/58
 val set_closesocketfunction : t -> (Unix.file_descr -> unit) -> unit
+*)
 val set_proxytype : t -> curlProxyType -> unit
 val set_protocols : t -> curlProto list -> unit
 val set_redirprotocols : t -> curlProto list -> unit
@@ -867,7 +871,7 @@ val get_localport : t -> int
 val get_conditionunmet : t -> bool
 (** @since 0.6.1 (libcurl 7.19.4) *)
 val get_certinfo : t -> string list list
-(** @since 0.9.3 *)
+(** @since 0.9.2 *)
 val get_http_version : t -> curlHTTPVersion
 
 (** {2 Object interface} *)
@@ -1013,7 +1017,7 @@ class handle :
     method set_seekfunction : (int64 -> curlSeek -> curlSeekResult) -> unit
     method set_autoreferer : bool -> unit
     method set_opensocketfunction : (Unix.file_descr -> unit) -> unit
-    method set_closesocketfunction : (Unix.file_descr -> unit) -> unit
+(*     method set_closesocketfunction : (Unix.file_descr -> unit) -> unit *)
     method set_proxytype : curlProxyType -> unit
     method set_resolve : (string * int * string) list -> (string * int) list -> unit
     method set_dns_servers : string list -> unit