diff --git a/src/ac/Makefile b/src/ac/Makefile
index e149ef9b..7444e6b2 100644
--- a/src/ac/Makefile
+++ b/src/ac/Makefile
@@ -28,6 +28,7 @@ CFLAGS += -DWITH_CW_LOG_DEBUG
 CFLAGS += -DWITH_RMAC_SUPPORT
 CFLAGS += -DWITH_DTLS
 CFLAGS += -DWITH_IPV6
+CFLAGS += -DWITH_LWAPP
 
 RM = /bin/rm -f