diff --git a/test/rb/Makefile.am b/test/rb/Makefile.am
index a6f431c..58b11f2 100644
--- a/test/rb/Makefile.am
+++ b/test/rb/Makefile.am
@@ -24,5 +24,5 @@
 	$(THRIFT) --gen rb ../SmallTest.thrift
 
 check: stubs
-	$(RUBY) test_suite.rb
+	$(RUBY) -I. test_suite.rb