diff --git a/Kbuild b/Kbuild
index 6abebab..73bab05 100644
--- a/Kbuild
+++ b/Kbuild
@@ -1645,6 +1645,7 @@
 	-DCONFIG_LEAK_DETECTION \
 	-DMEMORY_DEBUG \
 	-DNBUF_MEMORY_DEBUG \
+	-DNBUF_MAP_UNMAP_DEBUG \
 	-DTIMER_MANAGER
 endif