diff --git a/api/except.txt b/api/except.txt
index 7f8f81df50..930d03721e 100644
--- a/api/except.txt
+++ b/api/except.txt
@@ -1,3 +1,9 @@
 pkg net, func ListenUnixgram(string, *UnixAddr) (*UDPConn, error)
+pkg syscall (darwin-386), func Fchflags(string, int) error
+pkg syscall (darwin-386-cgo), func Fchflags(string, int) error
+pkg syscall (darwin-amd64), func Fchflags(string, int) error
+pkg syscall (darwin-amd64-cgo), func Fchflags(string, int) error
+pkg syscall (freebsd-386), func Fchflags(string, int) error
+pkg syscall (freebsd-amd64), func Fchflags(string, int) error
 pkg text/template/parse, type DotNode bool
 pkg text/template/parse, type Node interface { Copy, String, Type }
diff --git a/doc/go1.1.html b/doc/go1.1.html
index 1ab5c173df..b242e0734b 100644
--- a/doc/go1.1.html
+++ b/doc/go1.1.html
@@ -1023,7 +1023,15 @@ type now implements the
 </li>
 
 <li>
-The <a href="/pkg/syscall/"><code>syscall</code></a> package has received many updates to make it more inclusive of constants and system calls for each supported operating system.
+The <a href="/pkg/syscall/"><code>syscall</code></a> package's
+<a href="/pkg/syscall/#Fchflags"><code>Fchflags</code></a> function on various BSDs
+(including Darwin) has changed signature.
+It now takes an int as the first parameter instead of a string.
+Since this API change fixes a bug, it is permitted by the Go 1 compatibility rules.
+</li>
+<li>
+The <a href="/pkg/syscall/"><code>syscall</code></a> package also has received many updates
+to make it more inclusive of constants and system calls for each supported operating system.
 </li>
 
 <li>
diff --git a/src/pkg/syscall/syscall_darwin.go b/src/pkg/syscall/syscall_darwin.go
index 7fe406aaa2..75ef8f0a92 100644
--- a/src/pkg/syscall/syscall_darwin.go
+++ b/src/pkg/syscall/syscall_darwin.go
@@ -125,7 +125,7 @@ func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1)
 //sys	Exchangedata(path1 string, path2 string, options int) (err error)
 //sys	Exit(code int)
 //sys	Fchdir(fd int) (err error)
-//sys	Fchflags(path string, flags int) (err error)
+//sys	Fchflags(fd int, flags int) (err error)
 //sys	Fchmod(fd int, mode uint32) (err error)
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Flock(fd int, how int) (err error)
diff --git a/src/pkg/syscall/syscall_freebsd.go b/src/pkg/syscall/syscall_freebsd.go
index c7ffe223ea..9fbcc48c6c 100644
--- a/src/pkg/syscall/syscall_freebsd.go
+++ b/src/pkg/syscall/syscall_freebsd.go
@@ -118,7 +118,7 @@ func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
 //sysnb	Dup2(from int, to int) (err error)
 //sys	Exit(code int)
 //sys	Fchdir(fd int) (err error)
-//sys	Fchflags(path string, flags int) (err error)
+//sys	Fchflags(fd int, flags int) (err error)
 //sys	Fchmod(fd int, mode uint32) (err error)
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Flock(fd int, how int) (err error)
diff --git a/src/pkg/syscall/syscall_netbsd.go b/src/pkg/syscall/syscall_netbsd.go
index b0fa1112da..97812717f5 100644
--- a/src/pkg/syscall/syscall_netbsd.go
+++ b/src/pkg/syscall/syscall_netbsd.go
@@ -152,7 +152,7 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 //sysnb	Dup2(from int, to int) (err error)
 //sys	Exit(code int)
 //sys	Fchdir(fd int) (err error)
-//sys	Fchflags(path string, flags int) (err error)
+//sys	Fchflags(fd int, flags int) (err error)
 //sys	Fchmod(fd int, mode uint32) (err error)
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Flock(fd int, how int) (err error)
diff --git a/src/pkg/syscall/syscall_openbsd.go b/src/pkg/syscall/syscall_openbsd.go
index a146dca2cd..89c73215a0 100644
--- a/src/pkg/syscall/syscall_openbsd.go
+++ b/src/pkg/syscall/syscall_openbsd.go
@@ -110,7 +110,7 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 //sysnb	Dup2(from int, to int) (err error)
 //sys	Exit(code int)
 //sys	Fchdir(fd int) (err error)
-//sys	Fchflags(path string, flags int) (err error)
+//sys	Fchflags(fd int, flags int) (err error)
 //sys	Fchmod(fd int, mode uint32) (err error)
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Flock(fd int, how int) (err error)
diff --git a/src/pkg/syscall/zsyscall_darwin_386.go b/src/pkg/syscall/zsyscall_darwin_386.go
index 2f99b7f6c2..98500792d5 100644
--- a/src/pkg/syscall/zsyscall_darwin_386.go
+++ b/src/pkg/syscall/zsyscall_darwin_386.go
@@ -458,13 +458,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}
diff --git a/src/pkg/syscall/zsyscall_darwin_amd64.go b/src/pkg/syscall/zsyscall_darwin_amd64.go
index 0f08df4c52..ee810e0766 100644
--- a/src/pkg/syscall/zsyscall_darwin_amd64.go
+++ b/src/pkg/syscall/zsyscall_darwin_amd64.go
@@ -458,13 +458,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}
diff --git a/src/pkg/syscall/zsyscall_freebsd_386.go b/src/pkg/syscall/zsyscall_freebsd_386.go
index 5ca0bcb16b..631994fbad 100644
--- a/src/pkg/syscall/zsyscall_freebsd_386.go
+++ b/src/pkg/syscall/zsyscall_freebsd_386.go
@@ -418,13 +418,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}
diff --git a/src/pkg/syscall/zsyscall_freebsd_amd64.go b/src/pkg/syscall/zsyscall_freebsd_amd64.go
index 260677473f..1d51808530 100644
--- a/src/pkg/syscall/zsyscall_freebsd_amd64.go
+++ b/src/pkg/syscall/zsyscall_freebsd_amd64.go
@@ -418,13 +418,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}
diff --git a/src/pkg/syscall/zsyscall_netbsd_386.go b/src/pkg/syscall/zsyscall_netbsd_386.go
index 10ac072db8..0ee19bee1e 100644
--- a/src/pkg/syscall/zsyscall_netbsd_386.go
+++ b/src/pkg/syscall/zsyscall_netbsd_386.go
@@ -435,13 +435,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}
diff --git a/src/pkg/syscall/zsyscall_netbsd_amd64.go b/src/pkg/syscall/zsyscall_netbsd_amd64.go
index f10dc0bf41..b9d2721443 100644
--- a/src/pkg/syscall/zsyscall_netbsd_amd64.go
+++ b/src/pkg/syscall/zsyscall_netbsd_amd64.go
@@ -435,13 +435,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}
diff --git a/src/pkg/syscall/zsyscall_openbsd_386.go b/src/pkg/syscall/zsyscall_openbsd_386.go
index 60e907bd27..2c2a56732f 100644
--- a/src/pkg/syscall/zsyscall_openbsd_386.go
+++ b/src/pkg/syscall/zsyscall_openbsd_386.go
@@ -416,13 +416,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}
diff --git a/src/pkg/syscall/zsyscall_openbsd_amd64.go b/src/pkg/syscall/zsyscall_openbsd_amd64.go
index 1403dd7e79..4e14706965 100644
--- a/src/pkg/syscall/zsyscall_openbsd_amd64.go
+++ b/src/pkg/syscall/zsyscall_openbsd_amd64.go
@@ -416,13 +416,8 @@ func Fchdir(fd int) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Fchflags(path string, flags int) (err error) {
-	var _p0 *byte
-	_p0, err = BytePtrFromString(path)
-	if err != nil {
-		return
-	}
-	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(unsafe.Pointer(_p0)), uintptr(flags), 0)
+func Fchflags(fd int, flags int) (err error) {
+	_, _, e1 := Syscall(SYS_FCHFLAGS, uintptr(fd), uintptr(flags), 0)
 	if e1 != 0 {
 		err = e1
 	}