diff --git a/src/makefile.unix b/src/makefile.unix
index a2cbc7c77e1..6629067d8a8 100644
--- a/src/makefile.unix
+++ b/src/makefile.unix
@@ -133,7 +133,7 @@ bitcoind: $(OBJS:obj/%=obj/nogui/%)
 	$(CXX) $(CXXFLAGS) -o $@ $^ $(LIBS)
 
 obj/test/test_bitcoin.o: $(wildcard test/*.cpp) $(HEADERS)
-	$(CXX) -c $(CFLAGS) -o $@ test/test_bitcoin.cpp
+	$(CXX) -c $(CXXFLAGS) -o $@ test/test_bitcoin.cpp
 
 test_bitcoin: obj/test/test_bitcoin.o $(filter-out obj/nogui/init.o,$(OBJS:obj/%=obj/nogui/%))
 	$(CXX) $(CXXFLAGS) -o $@ $(LIBPATHS) $^ -Wl,-Bstatic -lboost_unit_test_framework $(LIBS)