diff --git a/graphdriver/devmapper/deviceset.go b/graphdriver/devmapper/deviceset.go
index e24840634d..66e44e3da0 100644
--- a/graphdriver/devmapper/deviceset.go
+++ b/graphdriver/devmapper/deviceset.go
@@ -344,7 +344,7 @@ func setCloseOnExec(name string) {
 			if link == name {
 				fd, err := strconv.Atoi(i.Name())
 				if err == nil {
-					syscall.CloseOnExec(fd)
+					SyscallCloseOnExec(fd)
 				}
 			}
 		}
@@ -716,7 +716,7 @@ func (devices *DeviceSet) Shutdown() error {
 
 	for path, count := range devices.activeMounts {
 		for i := count; i > 0; i-- {
-			if err := syscall.Unmount(path, 0); err != nil {
+			if err := SyscallUnmount(path, 0); err != nil {
 				utils.Debugf("Shutdown unmounting %s, error: %s\n", path, err)
 			}
 		}
@@ -758,9 +758,9 @@ func (devices *DeviceSet) MountDevice(hash, path string, readOnly bool) error {
 		flags = flags | syscall.MS_RDONLY
 	}
 
-	err := syscall.Mount(info.DevName(), path, "ext4", flags, "discard")
+	err := SyscallMount(info.DevName(), path, "ext4", flags, "discard")
 	if err != nil && err == syscall.EINVAL {
-		err = syscall.Mount(info.DevName(), path, "ext4", flags, "")
+		err = SyscallMount(info.DevName(), path, "ext4", flags, "")
 	}
 	if err != nil {
 		return fmt.Errorf("Error mounting '%s' on '%s': %s", info.DevName(), path, err)
@@ -779,7 +779,7 @@ func (devices *DeviceSet) UnmountDevice(hash, path string, deactivate bool) erro
 	defer devices.Unlock()
 
 	utils.Debugf("[devmapper] Unmount(%s)", path)
-	if err := syscall.Unmount(path, 0); err != nil {
+	if err := SyscallUnmount(path, 0); err != nil {
 		utils.Debugf("\n--->Err: %s\n", err)
 		return err
 	}
diff --git a/graphdriver/devmapper/devmapper.go b/graphdriver/devmapper/devmapper.go
index 6901ba9a6e..56130bd01c 100644
--- a/graphdriver/devmapper/devmapper.go
+++ b/graphdriver/devmapper/devmapper.go
@@ -216,7 +216,7 @@ func FindLoopDeviceFor(file *os.File) *os.File {
 	for i := 0; true; i++ {
 		path := fmt.Sprintf("/dev/loop%d", i)
 
-		file, err := os.OpenFile(path, os.O_RDWR, 0)
+		file, err := OSOpenFile(path, os.O_RDWR, 0)
 		if err != nil {
 			if os.IsNotExist(err) {
 				return nil
diff --git a/graphdriver/devmapper/devmapper_wrapper.go b/graphdriver/devmapper/devmapper_wrapper.go
index f9a7d039cf..e261db4351 100644
--- a/graphdriver/devmapper/devmapper_wrapper.go
+++ b/graphdriver/devmapper/devmapper_wrapper.go
@@ -241,19 +241,19 @@ func dmTaskAddTargetFct(task *CDmTask,
 
 func dmGetLoopbackBackingFile(fd uintptr) (uint64, uint64, syscall.Errno) {
 	var lo64 C.struct_loop_info64
-	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, C.LOOP_GET_STATUS64,
+	_, _, err := SyscallSyscall(syscall.SYS_IOCTL, fd, C.LOOP_GET_STATUS64,
 		uintptr(unsafe.Pointer(&lo64)))
 	return uint64(lo64.lo_device), uint64(lo64.lo_inode), err
 }
 
 func dmLoopbackSetCapacity(fd uintptr) syscall.Errno {
-	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, C.LOOP_SET_CAPACITY, 0)
+	_, _, err := SyscallSyscall(syscall.SYS_IOCTL, fd, C.LOOP_SET_CAPACITY, 0)
 	return err
 }
 
 func dmGetBlockSizeFct(fd uintptr) (int64, syscall.Errno) {
 	var size int64
-	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, C.BLKGETSIZE64,
+	_, _, err := SyscallSyscall(syscall.SYS_IOCTL, fd, C.BLKGETSIZE64,
 		uintptr(unsafe.Pointer(&size)))
 	return size, err
 }
@@ -308,7 +308,7 @@ func dmAttachLoopDeviceFct(filename string, fd *int) string {
 }
 
 func getBlockSizeFct(fd uintptr, size *uint64) syscall.Errno {
-	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, C.BLKGETSIZE64,
+	_, _, err := SyscallSyscall(syscall.SYS_IOCTL, fd, C.BLKGETSIZE64,
 		uintptr(unsafe.Pointer(&size)))
 	return err
 }
diff --git a/graphdriver/devmapper/sys.go b/graphdriver/devmapper/sys.go
new file mode 100644
index 0000000000..c2ba1263f0
--- /dev/null
+++ b/graphdriver/devmapper/sys.go
@@ -0,0 +1,15 @@
+package devmapper
+
+
+import (
+	"syscall"
+)
+
+
+var (
+	SyscallMount		= syscall.Mount
+	SyscallUnmount		= syscall.Unmount
+	SyscallCloseOnExec	= syscall.CloseOnExec
+	SyscallSyscall		= syscall.Syscall
+	OSOpenFile		= os.OpenFile
+)