diff --git a/CMakeLists.txt b/CMakeLists.txt
index be0e5f8d7c..74361998c4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -571,6 +571,8 @@ if(NOT CURL_DISABLE_LDAP)
       check_library_exists_concat("wldap32" cldap_open HAVE_WLDAP32)
       if(NOT HAVE_WLDAP32)
         set(USE_WIN32_LDAP OFF)
+      elseif(NOT CURL_DISABLE_LDAPS)
+        set(HAVE_LDAP_SSL ON)
       endif()
     endif()
   endif()
diff --git a/docs/KNOWN_BUGS b/docs/KNOWN_BUGS
index 3b35ad9a66..754ac03481 100644
--- a/docs/KNOWN_BUGS
+++ b/docs/KNOWN_BUGS
@@ -109,7 +109,6 @@ problems may have been fixed or changed somewhat since this was written.
  15.8 libcurl.pc uses absolute library paths
  15.10 libpsl is not supported
  15.11 ExternalProject_Add does not set CURL_CA_PATH
- 15.12 cannot enable LDAPS on Windows
  15.13 CMake build with MIT Kerberos does not work
 
  16. Applications
@@ -694,10 +693,6 @@ problems may have been fixed or changed somewhat since this was written.
 
  See https://github.com/curl/curl/issues/6313
 
-15.12 cannot enable LDAPS on Windows
-
- See https://github.com/curl/curl/issues/6284
-
 15.13 CMake build with MIT Kerberos does not work
 
  Minimum CMake version was bumped in curl 7.71.0 (#5358) Since CMake 3.2
diff --git a/lib/ldap.c b/lib/ldap.c
index 5e53f4c511..595e4b3b3b 100644
--- a/lib/ldap.c
+++ b/lib/ldap.c
@@ -140,6 +140,14 @@ static void _ldap_free_urldesc(LDAPURLDesc *ludp);
 #define ldap_err2string ldap_err2stringA
 #endif
 
+#if defined(USE_WIN32_LDAP) && defined(_MSC_VER) && (_MSC_VER <= 1600)
+/* Workaround for warning:
+   'type cast' : conversion from 'int' to 'void *' of greater size */
+#undef LDAP_OPT_ON
+#undef LDAP_OPT_OFF
+#define LDAP_OPT_ON   ((void *)(size_t)1)
+#define LDAP_OPT_OFF  ((void *)(size_t)0)
+#endif
 
 static CURLcode ldap_do(struct Curl_easy *data, bool *done);