diff --git a/[refs] b/[refs]
index d5fc1a74a55c..b60e26ad7929 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 20651af9ac60fd6e31360688ad44861a7d05256a
+refs/heads/master: a09771bef9a375091f8ae706d992e20970e5d1e7
diff --git a/trunk/drivers/virtio/virtio_balloon.c b/trunk/drivers/virtio/virtio_balloon.c
index 622aece1acce..c8a4332d1132 100644
--- a/trunk/drivers/virtio/virtio_balloon.c
+++ b/trunk/drivers/virtio/virtio_balloon.c
@@ -23,6 +23,7 @@
 #include <linux/swap.h>
 #include <linux/kthread.h>
 #include <linux/freezer.h>
+#include <linux/delay.h>
 
 struct virtio_balloon
 {