--- a/libraries/libldap/ldap.conf
+++ b/libraries/libldap/ldap.conf
@@ -11,3 +11,7 @@
 #SIZELIMIT	12
 #TIMELIMIT	15
 #DEREF		never
+
+# TLS certificates (needed for GnuTLS)
+TLS_CACERT	/etc/ssl/certs/ca-certificates.crt
+