diff --git a/test/rb/Makefile.am b/test/rb/Makefile.am
index 9cdd99b..7b74c6c 100644
--- a/test/rb/Makefile.am
+++ b/test/rb/Makefile.am
@@ -17,12 +17,14 @@
 # under the License.
 #
 
-THRIFT = $(top_srcdir)/compiler/cpp/thrift
+THRIFT = $(top_builddir)/compiler/cpp/thrift
 
-stubs: ../ThriftTest.thrift ../SmallTest.thrift
+stubs: $(THRIFT) ../ThriftTest.thrift ../SmallTest.thrift
 	$(THRIFT) --gen rb ../ThriftTest.thrift
 	$(THRIFT) --gen rb ../SmallTest.thrift
 
+precross: stubs
+
 check: stubs
 if HAVE_BUNDLER
 	$(BUNDLER) install