diff --git a/config/filter.d/dovecot.conf b/config/filter.d/dovecot.conf
index 856c220e..136a3947 100644
--- a/config/filter.d/dovecot.conf
+++ b/config/filter.d/dovecot.conf
@@ -13,6 +13,7 @@ failregex = ^%(__prefix_line)s(%(__pam_auth)s(\(dovecot:auth\))?:)?\s+authentica
             ^%(__prefix_line)s(pop3|imap)-login: (Info: )?(Aborted login|Disconnected)(: Inactivity)? \(((auth failed, \d+ attempts)( in \d+ secs)?|tried to use (disabled|disallowed) \S+ auth)\):( user=<\S*>,)?( method=\S+,)? rip=<HOST>(, lip=(\d{1,3}\.){3}\d{1,3})?(, TLS( handshaking(: SSL_accept\(\) failed: error:[\dA-F]+:SSL routines:[TLS\d]+_GET_CLIENT_HELLO:unknown protocol)?)?(: Disconnected)?)?(, session=<\S+>)?\s*$
             ^%(__prefix_line)s(Info|dovecot: auth\(default\)|auth-worker\(\d+\)): pam\(\S+,<HOST>\): pam_authenticate\(\) failed: (User not known to the underlying authentication module: \d+ Time\(s\)|Authentication failure \(password mismatch\?\))\s*$
             ^%(__prefix_line)s(auth|auth-worker\(\d+\)): (pam|passwd-file)\(\S+,<HOST>\): unknown user\s*$
+            ^%(__prefix_line)s(auth|auth-worker\(\d+\)): Info: ldap\(\S*,<HOST>,\S*\): invalid credentials\s*$
 
 ignoreregex = 
 
@@ -22,9 +23,10 @@ journalmatch = _SYSTEMD_UNIT=dovecot.service
 
 # DEV Notes:
 # * the first regex is essentially a copy of pam-generic.conf
-# * Probably doesn't do dovecot sql/ldap backends properly
+# * Probably doesn't do dovecot sql/ldap backends properly (resolved in edit 21/03/2016)
 # * Removed the 'no auth attempts' log lines from the matches because produces
 #    lots of false positives on misconfigured MTAs making regexp unusable
 #
 # Author: Martin Waschbuesch
 #         Daniel Black (rewrote with begin and end anchors)
+#         Martin O'Neal (added LDAP authentication failure regex)