diff --git a/unix/mkerrors.sh b/unix/mkerrors.sh
index 086d6941..f2bc8631 100755
--- a/unix/mkerrors.sh
+++ b/unix/mkerrors.sh
@@ -502,7 +502,7 @@ ccflags="$@"
 		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|MCAST|EVFILT|NOTE|SHUT|PROT|MAP|MFD|T?PACKET|MSG|SCM|MCL|DT|MADV|PR|LOCAL)_/ ||
 		$2 ~ /^TP_STATUS_/ ||
 		$2 ~ /^FALLOC_/ ||
-		$2 ~ /^ICMP(V6)?_FILTER$/ ||
+		$2 ~ /^ICMP(V6)?_FILTER/ ||
 		$2 == "SOMAXCONN" ||
 		$2 == "NAME_MAX" ||
 		$2 == "IFNAMSIZ" ||
diff --git a/unix/zerrors_linux.go b/unix/zerrors_linux.go
index 3b1b9287..35de419c 100644
--- a/unix/zerrors_linux.go
+++ b/unix/zerrors_linux.go
@@ -974,6 +974,10 @@ const (
 	HUGETLBFS_MAGIC                             = 0x958458f6
 	IBSHIFT                                     = 0x10
 	ICMPV6_FILTER                               = 0x1
+	ICMPV6_FILTER_BLOCK                         = 0x1
+	ICMPV6_FILTER_BLOCKOTHERS                   = 0x3
+	ICMPV6_FILTER_PASS                          = 0x2
+	ICMPV6_FILTER_PASSONLY                      = 0x4
 	ICMP_FILTER                                 = 0x1
 	ICRNL                                       = 0x100
 	IFA_F_DADFAILED                             = 0x8