diff --git a/net/core/Makefile b/net/core/Makefile
index d47092b..796f46e 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -18,4 +18,5 @@
 obj-$(CONFIG_NET_DMA) += user_dma.o
 obj-$(CONFIG_FIB_RULES) += fib_rules.o
 obj-$(CONFIG_TRACEPOINTS) += net-traces.o
+obj-$(CONFIG_NET_DROP_MONITOR) += drop_monitor.o