diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index a776bc3ed7..3a10baa9ce 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -135,14 +135,6 @@ static int	CheckBSDAuth(Port *port, char *user);
 #else
 #include <winldap.h>
 
-/* Correct header from the Platform SDK */
-typedef
-ULONG		(*__ldap_start_tls_sA) (IN PLDAP ExternalHandle,
-									OUT PULONG ServerReturnValue,
-									OUT LDAPMessage **result,
-									IN PLDAPControlA * ServerControls,
-									IN PLDAPControlA * ClientControls
-);
 #endif
 
 static int	CheckLDAPAuth(Port *port);
@@ -2348,48 +2340,7 @@ InitializeLDAPConnection(Port *port, LDAP **ldap)
 #ifndef WIN32
 		if ((r = ldap_start_tls_s(*ldap, NULL, NULL)) != LDAP_SUCCESS)
 #else
-		static __ldap_start_tls_sA _ldap_start_tls_sA = NULL;
-
-		if (_ldap_start_tls_sA == NULL)
-		{
-			/*
-			 * Need to load this function dynamically because it may not exist
-			 * on Windows, and causes a load error for the whole exe if
-			 * referenced.
-			 */
-			HANDLE		ldaphandle;
-
-			ldaphandle = LoadLibrary("WLDAP32.DLL");
-			if (ldaphandle == NULL)
-			{
-				/*
-				 * should never happen since we import other files from
-				 * wldap32, but check anyway
-				 */
-				ereport(LOG,
-						(errmsg("could not load library \"%s\": error code %lu",
-								"WLDAP32.DLL", GetLastError())));
-				ldap_unbind(*ldap);
-				return STATUS_ERROR;
-			}
-			_ldap_start_tls_sA = (__ldap_start_tls_sA) (pg_funcptr_t) GetProcAddress(ldaphandle, "ldap_start_tls_sA");
-			if (_ldap_start_tls_sA == NULL)
-			{
-				ereport(LOG,
-						(errmsg("could not load function _ldap_start_tls_sA in wldap32.dll"),
-						 errdetail("LDAP over SSL is not supported on this platform.")));
-				ldap_unbind(*ldap);
-				FreeLibrary(ldaphandle);
-				return STATUS_ERROR;
-			}
-
-			/*
-			 * Leak LDAP handle on purpose, because we need the library to
-			 * stay open. This is ok because it will only ever be leaked once
-			 * per process and is automatically cleaned up on process exit.
-			 */
-		}
-		if ((r = _ldap_start_tls_sA(*ldap, NULL, NULL, NULL, NULL)) != LDAP_SUCCESS)
+		if ((r = ldap_start_tls_sA(*ldap, NULL, NULL, NULL, NULL)) != LDAP_SUCCESS)
 #endif
 		{
 			ereport(LOG,