diff --git a/unix/zsyscall_freebsd_386.go b/unix/zsyscall_freebsd_386.go
index 558b633a..eef8eca6 100644
--- a/unix/zsyscall_freebsd_386.go
+++ b/unix/zsyscall_freebsd_386.go
@@ -655,7 +655,7 @@ func ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (
 func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
 	_, _, e1 := Syscall6(SYS_POSIX_FADVISE, uintptr(fd), uintptr(offset), uintptr(offset>>32), uintptr(length), uintptr(length>>32), uintptr(advice))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
diff --git a/unix/zsyscall_freebsd_amd64.go b/unix/zsyscall_freebsd_amd64.go
index d0cd0b4a..507166bc 100644
--- a/unix/zsyscall_freebsd_amd64.go
+++ b/unix/zsyscall_freebsd_amd64.go
@@ -655,7 +655,7 @@ func ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (
 func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
 	_, _, e1 := Syscall6(SYS_POSIX_FADVISE, uintptr(fd), uintptr(offset), uintptr(length), uintptr(advice), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
diff --git a/unix/zsyscall_freebsd_arm.go b/unix/zsyscall_freebsd_arm.go
index 1fb4603f..0b7a34eb 100644
--- a/unix/zsyscall_freebsd_arm.go
+++ b/unix/zsyscall_freebsd_arm.go
@@ -655,7 +655,7 @@ func ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (
 func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
 	_, _, e1 := Syscall9(SYS_POSIX_FADVISE, uintptr(fd), 0, uintptr(offset), uintptr(offset>>32), uintptr(length), uintptr(length>>32), uintptr(advice), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
diff --git a/unix/zsyscall_linux_386.go b/unix/zsyscall_linux_386.go
index fcfbfa2f..eed42a55 100644
--- a/unix/zsyscall_linux_386.go
+++ b/unix/zsyscall_linux_386.go
@@ -414,7 +414,7 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
 func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
 	_, _, e1 := Syscall6(SYS_FADVISE64, uintptr(fd), uintptr(offset), uintptr(offset>>32), uintptr(length), uintptr(length>>32), uintptr(advice))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
@@ -1422,7 +1422,7 @@ func Chown(path string, uid int, gid int) (err error) {
 func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
 	_, _, e1 := Syscall6(SYS_FADVISE64_64, uintptr(fd), uintptr(offset), uintptr(offset>>32), uintptr(length), uintptr(length>>32), uintptr(advice))
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
diff --git a/unix/zsyscall_linux_amd64.go b/unix/zsyscall_linux_amd64.go
index babe4718..36410b65 100644
--- a/unix/zsyscall_linux_amd64.go
+++ b/unix/zsyscall_linux_amd64.go
@@ -414,7 +414,7 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
 func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
 	_, _, e1 := Syscall6(SYS_FADVISE64, uintptr(fd), uintptr(offset), uintptr(length), uintptr(advice), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }
diff --git a/unix/zsyscall_linux_arm.go b/unix/zsyscall_linux_arm.go
index 2cdcf6f3..475fb992 100644
--- a/unix/zsyscall_linux_arm.go
+++ b/unix/zsyscall_linux_arm.go
@@ -414,7 +414,7 @@ func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
 func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
 	_, _, e1 := Syscall9(SYS_FADVISE64, uintptr(fd), 0, uintptr(offset), uintptr(offset>>32), uintptr(length), uintptr(length>>32), uintptr(advice), 0, 0)
 	if e1 != 0 {
-		err = e1
+		err = errnoErr(e1)
 	}
 	return
 }