diff --git a/config/filter.d/proftpd.conf b/config/filter.d/proftpd.conf
index 52a741e8..21c8fc2e 100644
--- a/config/filter.d/proftpd.conf
+++ b/config/filter.d/proftpd.conf
@@ -14,7 +14,7 @@
 #          (?:::f{4,6}:)?(?P<host>\S+)
 # Values: TEXT
 #
-failregex = \(\S+\[<HOST>\]\)[: -]+ USER \S+: no such user found from \S+ \[[0-9.]+\] to \S+:\S+$
+failregex = \(\S+\[<HOST>\]\)[: -]+ USER \S+: no such user found from \S+ \[\S+\] to \S+:\S+$
             \(\S+\[<HOST>\]\)[: -]+ USER \S+ \(Login failed\): Incorrect password\.$
             \(\S+\[<HOST>\]\)[: -]+ SECURITY VIOLATION: \S+ login attempted\.$
             \(\S+\[<HOST>\]\)[: -]+ Maximum login attempts \(\d+\) exceeded$