diff --git a/libcontainer/nsinit/init.go b/libcontainer/nsinit/init.go
index a123757..3bbcfcc 100644
--- a/libcontainer/nsinit/init.go
+++ b/libcontainer/nsinit/init.go
@@ -66,8 +66,10 @@ func Init(container *libcontainer.Container, uncleanRootfs, consolePath string,
 	if err := mount.InitializeMountNamespace(rootfs, consolePath, container); err != nil {
 		return fmt.Errorf("setup mount namespace %s", err)
 	}
-	if err := system.Sethostname(container.Hostname); err != nil {
-		return fmt.Errorf("sethostname %s", err)
+	if container.Hostname != "" {
+		if err := system.Sethostname(container.Hostname); err != nil {
+			return fmt.Errorf("sethostname %s", err)
+		}
 	}
 
 	runtime.LockOSThread()