diff --git a/src/Makefile.am b/src/Makefile.am
index 3fc5554..0dfe63b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -29,3 +29,5 @@
 		-d ${srcdir}/example \
 		-o ${builddir}/$@ \
 		generate-cpp
+
+SUBDIRS = . test