diff --git a/unix/mkerrors.sh b/unix/mkerrors.sh
index 318f1fe..40c2058 100755
--- a/unix/mkerrors.sh
+++ b/unix/mkerrors.sh
@@ -376,7 +376,7 @@
 		$2 == "IFNAMSIZ" ||
 		$2 ~ /^CTL_(MAXNAME|NET|QUERY)$/ ||
 		$2 ~ /^SYSCTL_VERS/ ||
-		$2 ~ /^(MS|MNT)_/ ||
+		$2 ~ /^(MS|MNT|UMOUNT)_/ ||
 		$2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ ||
 		$2 ~ /^(O|F|E?FD|NAME|S|PTRACE|PT)_/ ||
 		$2 ~ /^LINUX_REBOOT_CMD_/ ||
diff --git a/unix/zerrors_linux_386.go b/unix/zerrors_linux_386.go
index 93383aa..02a0861 100644
--- a/unix/zerrors_linux_386.go
+++ b/unix/zerrors_linux_386.go
@@ -1755,6 +1755,7 @@
 	TUNSETVNETBE                         = 0x400454de
 	TUNSETVNETHDRSZ                      = 0x400454d8
 	TUNSETVNETLE                         = 0x400454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x4
 	VEOL                                 = 0xb
diff --git a/unix/zerrors_linux_amd64.go b/unix/zerrors_linux_amd64.go
index f28966a..538193c 100644
--- a/unix/zerrors_linux_amd64.go
+++ b/unix/zerrors_linux_amd64.go
@@ -1756,6 +1756,7 @@
 	TUNSETVNETBE                         = 0x400454de
 	TUNSETVNETHDRSZ                      = 0x400454d8
 	TUNSETVNETLE                         = 0x400454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x4
 	VEOL                                 = 0xb
diff --git a/unix/zerrors_linux_arm.go b/unix/zerrors_linux_arm.go
index 621a88b..ac9a8b3 100644
--- a/unix/zerrors_linux_arm.go
+++ b/unix/zerrors_linux_arm.go
@@ -1760,6 +1760,7 @@
 	TUNSETVNETBE                         = 0x400454de
 	TUNSETVNETHDRSZ                      = 0x400454d8
 	TUNSETVNETLE                         = 0x400454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x4
 	VEOL                                 = 0xb
diff --git a/unix/zerrors_linux_arm64.go b/unix/zerrors_linux_arm64.go
index 2196dd6..90cda51 100644
--- a/unix/zerrors_linux_arm64.go
+++ b/unix/zerrors_linux_arm64.go
@@ -1745,6 +1745,7 @@
 	TUNSETVNETBE                         = 0x400454de
 	TUNSETVNETHDRSZ                      = 0x400454d8
 	TUNSETVNETLE                         = 0x400454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x4
 	VEOL                                 = 0xb
diff --git a/unix/zerrors_linux_mips.go b/unix/zerrors_linux_mips.go
index 7ac90c7..0434524 100644
--- a/unix/zerrors_linux_mips.go
+++ b/unix/zerrors_linux_mips.go
@@ -1759,6 +1759,7 @@
 	TUNSETVNETBE                         = 0x800454de
 	TUNSETVNETHDRSZ                      = 0x800454d8
 	TUNSETVNETLE                         = 0x800454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x10
 	VEOL                                 = 0x11
diff --git a/unix/zerrors_linux_mips64.go b/unix/zerrors_linux_mips64.go
index 0d1155d..9cf876d 100644
--- a/unix/zerrors_linux_mips64.go
+++ b/unix/zerrors_linux_mips64.go
@@ -1759,6 +1759,7 @@
 	TUNSETVNETBE                         = 0x800454de
 	TUNSETVNETHDRSZ                      = 0x800454d8
 	TUNSETVNETLE                         = 0x800454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x10
 	VEOL                                 = 0x11
diff --git a/unix/zerrors_linux_mips64le.go b/unix/zerrors_linux_mips64le.go
index 8e4d901..7a070a9 100644
--- a/unix/zerrors_linux_mips64le.go
+++ b/unix/zerrors_linux_mips64le.go
@@ -1759,6 +1759,7 @@
 	TUNSETVNETBE                         = 0x800454de
 	TUNSETVNETHDRSZ                      = 0x800454d8
 	TUNSETVNETLE                         = 0x800454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x10
 	VEOL                                 = 0x11
diff --git a/unix/zerrors_linux_mipsle.go b/unix/zerrors_linux_mipsle.go
index 9430745..c48ec18 100644
--- a/unix/zerrors_linux_mipsle.go
+++ b/unix/zerrors_linux_mipsle.go
@@ -1759,6 +1759,7 @@
 	TUNSETVNETBE                         = 0x800454de
 	TUNSETVNETHDRSZ                      = 0x800454d8
 	TUNSETVNETLE                         = 0x800454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x10
 	VEOL                                 = 0x11
diff --git a/unix/zerrors_linux_ppc64.go b/unix/zerrors_linux_ppc64.go
index 6583076..0949773 100644
--- a/unix/zerrors_linux_ppc64.go
+++ b/unix/zerrors_linux_ppc64.go
@@ -1817,6 +1817,7 @@
 	TUNSETVNETBE                         = 0x800454de
 	TUNSETVNETHDRSZ                      = 0x800454d8
 	TUNSETVNETLE                         = 0x800454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0x10
 	VEOF                                 = 0x4
 	VEOL                                 = 0x6
diff --git a/unix/zerrors_linux_ppc64le.go b/unix/zerrors_linux_ppc64le.go
index d1bea30..d195b63 100644
--- a/unix/zerrors_linux_ppc64le.go
+++ b/unix/zerrors_linux_ppc64le.go
@@ -1817,6 +1817,7 @@
 	TUNSETVNETBE                         = 0x800454de
 	TUNSETVNETHDRSZ                      = 0x800454d8
 	TUNSETVNETLE                         = 0x800454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0x10
 	VEOF                                 = 0x4
 	VEOL                                 = 0x6
diff --git a/unix/zerrors_linux_s390x.go b/unix/zerrors_linux_s390x.go
index c13c810..9e9049b 100644
--- a/unix/zerrors_linux_s390x.go
+++ b/unix/zerrors_linux_s390x.go
@@ -1817,6 +1817,7 @@
 	TUNSETVNETBE                         = 0x400454de
 	TUNSETVNETHDRSZ                      = 0x400454d8
 	TUNSETVNETLE                         = 0x400454dc
+	UMOUNT_NOFOLLOW                      = 0x8
 	VDISCARD                             = 0xd
 	VEOF                                 = 0x4
 	VEOL                                 = 0xb