diff --git a/lib/cpp/test/Makefile.am b/lib/cpp/test/Makefile.am
index ba32cb8..012d226 100755
--- a/lib/cpp/test/Makefile.am
+++ b/lib/cpp/test/Makefile.am
@@ -266,10 +266,7 @@
 gen-cpp/ChildService.cpp: processor/proc.thrift
 	$(THRIFT) --gen cpp:templates,cob_style $<
 
-INCLUDES = \
-	-I$(top_srcdir)/lib/cpp/src
-
-AM_CPPFLAGS = $(BOOST_CPPFLAGS)
+AM_CPPFLAGS = $(BOOST_CPPFLAGS) -I$(top_srcdir)/lib/cpp/src
 AM_LDFLAGS = $(BOOST_LDFLAGS)
 AM_CXXFLAGS = -Wall