diff --git a/make/topdir.mk b/make/topdir.mk
index dd9ff3dd..39c223d1 100644
--- a/make/topdir.mk
+++ b/make/topdir.mk
@@ -4,7 +4,7 @@ clean: topdir.clean
 distclean: topdir.distclean
 config:
 
-SUBDIRS ?= $(wildcard inst/pre make scripts tools include lib bin \
+SUBDIRS ?= $(wildcard inst/pre make scripts tools src include lib bin \
 	util plugins conf config cfg doc test inst/post)
 
 ifneq ($(wildcard $(TOPDIR)/make/defs.mk),)