diff --git a/drivers/net/wireless/rtl8821cu/Makefile b/drivers/net/wireless/rtl8821cu/Makefile
index 34ddda0f0723..f2bdd4043cd7 100644
--- a/drivers/net/wireless/rtl8821cu/Makefile
+++ b/drivers/net/wireless/rtl8821cu/Makefile
@@ -1,3 +1,5 @@
+src = $(PWD)/drivers/net/wireless/rtl8821cu
+
 EXTRA_CFLAGS += $(USER_EXTRA_CFLAGS)
 EXTRA_CFLAGS += -O1
 #EXTRA_CFLAGS += -O3