diff --git a/test/Makefile.am b/test/Makefile.am
index 47e6b76..bac5b06 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -8,6 +8,10 @@
 SUBDIRS += py
 endif
 
+if ENABLE_RUBY
+SUBDIRS += rb
+endif
+
 noinst_LTLIBRARIES = libtestgencpp.la
 libtestgencpp_la_SOURCES = \
 	gen-cpp/DebugProtoTest_types.cpp \