diff --git a/Kbuild b/Kbuild
index 7947f14..f85c14a 100644
--- a/Kbuild
+++ b/Kbuild
@@ -2774,6 +2774,8 @@
 
 ccflags-$(CONFIG_HASTINGS_BT_WAR) += -DHASTINGS_BT_WAR
 
+cppflags-$(CONFIG_SLUB_DEBUG_ON) += -DHIF_CONFIG_SLUB_DEBUG_ON
+
 KBUILD_CPPFLAGS += $(cppflags-y)
 
 # Currently, for versions of gcc which support it, the kernel Makefile