diff --git a/test/rb/Makefile.am b/test/rb/Makefile.am
index 5dd7559..9c5d557 100644
--- a/test/rb/Makefile.am
+++ b/test/rb/Makefile.am
@@ -33,5 +33,8 @@
 clean-local:
 	$(RM) -r gen-rb/
 
+distdir:
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
 dist-hook:
 	$(RM) -r $(distdir)/gen-rb/