diff --git a/unix/example_exec_test.go b/unix/example_exec_test.go
new file mode 100644
index 0000000..bb4d3bf
--- /dev/null
+++ b/unix/example_exec_test.go
@@ -0,0 +1,19 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package unix_test
+
+import (
+	"log"
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+func ExampleExec() {
+	err := unix.Exec("/bin/ls", []string{"ls", "-al"}, os.Environ())
+	log.Fatal(err)
+}
diff --git a/unix/example_test.go b/unix/example_flock_test.go
similarity index 75%
rename from unix/example_test.go
rename to unix/example_flock_test.go
index ae008f5..6c91748 100644
--- a/unix/example_test.go
+++ b/unix/example_flock_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package unix_test
 
@@ -13,11 +13,6 @@
 	"golang.org/x/sys/unix"
 )
 
-func ExampleExec() {
-	err := unix.Exec("/bin/ls", []string{"ls", "-al"}, os.Environ())
-	log.Fatal(err)
-}
-
 func ExampleFlock() {
 	f, _ := os.Create("example.lock")
 	if err := unix.Flock(int(f.Fd()), unix.LOCK_EX); err != nil {
diff --git a/unix/syscall_aix.go b/unix/syscall_aix.go
index f8eac17..992a8ea 100644
--- a/unix/syscall_aix.go
+++ b/unix/syscall_aix.go
@@ -13,10 +13,7 @@
 
 package unix
 
-import (
-	"syscall"
-	"unsafe"
-)
+import "unsafe"
 
 /*
  * Wrapped
@@ -385,10 +382,6 @@
 
 //sys	fcntl(fd int, cmd int, arg int) (val int, err error)
 
-func Flock(fd int, how int) (err error) {
-	return syscall.Flock(fd, how)
-}
-
 /*
  * Direct access
  */