diff --git a/make/lo.mk b/make/lo.mk
index e4ff0500..2bfe91d6 100644
--- a/make/lo.mk
+++ b/make/lo.mk
@@ -17,7 +17,7 @@ LOADABLE_OBJ_CPP              = $(patsubst %,%.cpp,$(LOADABLE_OBJS))
 LOADABLE_OBJS_O               = $(patsubst %,%.o,$(LOADABLE_OBJS))
 
 OTHER_CPP_IGNORE              = $(patsubst %,$(CPP_PREFIX)%.cpp,$(LOADABLE_OBJ_IGNORE))
-OTHER_CPP                     = $(filter-out $(LOADABLE_OBJ_CPP) $(OTHER_CPP_IGNORE),$(wildcard *.cpp))
+OTHER_CPP                    ?= $(filter-out $(LOADABLE_OBJ_CPP) $(OTHER_CPP_IGNORE),$(wildcard *.cpp))
 ifneq ($(OTHER_CPP),)
 OTHER_O                       = $(patsubst %.cpp,%.o,$(OTHER_CPP))
 OTHER_LIB                     = liblocal.a