diff --git a/test/Makefile.am b/test/Makefile.am
index 5f2ce8d..cc92ce0 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -19,7 +19,8 @@
 	gen-cpp/ThriftTest_constants.cpp \
 	gen-cpp/ThriftTest.cpp \
 	gen-cpp/ThriftTest_types.cpp \
-	ThriftTest_extras.cpp
+	ThriftTest_extras.cpp \
+	DebugProtoTest_extras.cpp
 
 libtestgencpp_la_LIBADD = $(top_builddir)/lib/cpp/libthrift.la