diff --git a/Kbuild b/Kbuild
index 711ac6f..6fc1ea6 100644
--- a/Kbuild
+++ b/Kbuild
@@ -2775,6 +2775,7 @@
 
 cppflags-y += -DFEATURE_NBUFF_REPLENISH_TIMER
 cppflags-y += -DPEER_CACHE_RX_PKTS
+cppflags-y += -DPCIE_REG_WINDOW_LOCAL_NO_CACHE
 
 ccflags-$(CONFIG_HASTINGS_BT_WAR) += -DHASTINGS_BT_WAR