diff --git a/Kbuild b/Kbuild
index 89141fb..ac45632 100644
--- a/Kbuild
+++ b/Kbuild
@@ -2839,6 +2839,7 @@
 cppflags-y += -DPEER_CACHE_RX_PKTS
 cppflags-y += -DPCIE_REG_WINDOW_LOCAL_NO_CACHE
 
+cppflags-y += -DSERIALIZE_VDEV_RESP_TIMER
 cppflags-y += -DTGT_IF_VDEV_MGR_CONV
 
 ccflags-$(CONFIG_HASTINGS_BT_WAR) += -DHASTINGS_BT_WAR