diff --git a/lib/Makefile.am b/lib/Makefile.am
index 44bb9ff..650f382 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -17,7 +17,7 @@
 # under the License.
 #
 
-SUBDIRS =
+SUBDIRS = json
 PRECROSS_TARGET =
 
 if WITH_CPP