diff --git a/Makefile.am b/Makefile.am
index 5e56c258..159aa3b6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = doc src
+SUBDIRS = doc src tests
 BOOTCLEAN_SUBDIRS = $(SUBDIRS)
 DIST_SUBDIRS      = $(SUBDIRS)