diff --git a/test/cpp/Makefile.am b/test/cpp/Makefile.am
index 82dc518..e2c21f5 100755
--- a/test/cpp/Makefile.am
+++ b/test/cpp/Makefile.am
@@ -107,7 +107,7 @@
 	$(THRIFT) --gen cpp $<
 
 AM_CPPFLAGS = $(BOOST_CPPFLAGS) $(LIBEVENT_CPPFLAGS) -I$(top_srcdir)/lib/cpp/src -Igen-cpp
-AM_CXXFLAGS = -Wall -Wextra -pedantic -D__STDC_LIMIT_MACROS
+AM_CXXFLAGS = -Wall -Wextra -pedantic -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
 AM_LDFLAGS = $(BOOST_LDFLAGS) $(LIBEVENT_LDFLAGS) $(ZLIB_LIBS)
 
 clean-local: