diff --git a/unix/zerrors_openbsd_386.go b/unix/zerrors_openbsd_386.go
index 4faf7894..5402bd55 100644
--- a/unix/zerrors_openbsd_386.go
+++ b/unix/zerrors_openbsd_386.go
@@ -881,14 +881,15 @@ const (
 	MADV_SPACEAVAIL                   = 0x5
 	MADV_WILLNEED                     = 0x3
 	MAP_ANON                          = 0x1000
-	MAP_COPY                          = 0x4
+	MAP_ANONYMOUS                     = 0x1000
+	MAP_CONCEAL                       = 0x8000
+	MAP_COPY                          = 0x2
 	MAP_FILE                          = 0x0
 	MAP_FIXED                         = 0x10
-	MAP_FLAGMASK                      = 0x1ff7
-	MAP_HASSEMAPHORE                  = 0x200
-	MAP_INHERIT                       = 0x80
+	MAP_FLAGMASK                      = 0xfff7
+	MAP_HASSEMAPHORE                  = 0x0
+	MAP_INHERIT                       = 0x0
 	MAP_INHERIT_COPY                  = 0x1
-	MAP_INHERIT_DONATE_COPY           = 0x3
 	MAP_INHERIT_NONE                  = 0x2
 	MAP_INHERIT_SHARE                 = 0x0
 	MAP_NOEXTEND                      = 0x100
@@ -896,7 +897,8 @@ const (
 	MAP_PRIVATE                       = 0x2
 	MAP_RENAME                        = 0x20
 	MAP_SHARED                        = 0x1
-	MAP_TRYFIXED                      = 0x400
+	MAP_STACK                         = 0x4000
+	MAP_TRYFIXED                      = 0x0
 	MCL_CURRENT                       = 0x1
 	MCL_FUTURE                        = 0x2
 	MNT_ASYNC                         = 0x40
diff --git a/unix/zerrors_openbsd_amd64.go b/unix/zerrors_openbsd_amd64.go
index c2259316..ffaf2d2f 100644
--- a/unix/zerrors_openbsd_amd64.go
+++ b/unix/zerrors_openbsd_amd64.go
@@ -920,10 +920,11 @@ const (
 	MADV_WILLNEED                     = 0x3
 	MAP_ANON                          = 0x1000
 	MAP_ANONYMOUS                     = 0x1000
+	MAP_CONCEAL                       = 0x8000
 	MAP_COPY                          = 0x2
 	MAP_FILE                          = 0x0
 	MAP_FIXED                         = 0x10
-	MAP_FLAGMASK                      = 0x7ff7
+	MAP_FLAGMASK                      = 0xfff7
 	MAP_HASSEMAPHORE                  = 0x0
 	MAP_INHERIT                       = 0x0
 	MAP_INHERIT_COPY                  = 0x1
diff --git a/unix/zerrors_openbsd_arm.go b/unix/zerrors_openbsd_arm.go
index ac56a907..7aa796a6 100644
--- a/unix/zerrors_openbsd_arm.go
+++ b/unix/zerrors_openbsd_arm.go
@@ -1,11 +1,11 @@
 // mkerrors.sh
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
+// +build arm,openbsd
+
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs -- _const.go
 
-// +build arm,openbsd
-
 package unix
 
 import "syscall"
@@ -881,10 +881,11 @@ const (
 	MADV_WILLNEED                     = 0x3
 	MAP_ANON                          = 0x1000
 	MAP_ANONYMOUS                     = 0x1000
+	MAP_CONCEAL                       = 0x8000
 	MAP_COPY                          = 0x2
 	MAP_FILE                          = 0x0
 	MAP_FIXED                         = 0x10
-	MAP_FLAGMASK                      = 0x3ff7
+	MAP_FLAGMASK                      = 0xfff7
 	MAP_HASSEMAPHORE                  = 0x0
 	MAP_INHERIT                       = 0x0
 	MAP_INHERIT_COPY                  = 0x1
@@ -896,6 +897,7 @@ const (
 	MAP_PRIVATE                       = 0x2
 	MAP_RENAME                        = 0x0
 	MAP_SHARED                        = 0x1
+	MAP_STACK                         = 0x4000
 	MAP_TRYFIXED                      = 0x0
 	MCL_CURRENT                       = 0x1
 	MCL_FUTURE                        = 0x2