diff --git a/Makefile.am b/Makefile.am
index 909b356..b9a4331 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,7 @@
 AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
 
+SUBDIRS = include src
+
 BUILT_SOURCES = $(top_srcdir)/.version
 EXTRA_DIST = git-version-gen
 $(top_srcdir)/.version: