diff --git a/test/Makefile.am b/test/Makefile.am
index f4dd05c..118d869 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -66,13 +66,13 @@
 THRIFT = $(top_srcdir)/compiler/cpp/thrift
 
 gen-cpp/DebugProtoTest_types.cpp gen-cpp/PartiallyReflectable.cpp: DebugProtoTest.thrift
-	$(THRIFT) -cpp $<
+	$(THRIFT) --gen cpp $<
 
 gen-cpp/OptionalRequiredTest_types.cpp: OptionalRequiredTest.thrift
-	$(THRIFT) -cpp $<
+	$(THRIFT) --gen cpp $<
 
 gen-cpp/Service.cpp gen-cpp/StressTest_types.cpp: StressTest.thrift
-	$(THRIFT) -cpp $<
+	$(THRIFT) --gen cpp $<
 
 
 INCLUDES = \