diff --git a/make/defs-cpp.mk b/make/defs-cpp.mk
index d983f7da..84bf05b1 100644
--- a/make/defs-cpp.mk
+++ b/make/defs-cpp.mk
@@ -446,7 +446,7 @@ SRC_HEADERED                += $(shell if [ "$(LOCAL_SRC)" ]; then grep -ic "it
 SRC_UNHEADERED              += $(filter-out $(SRC_HEADERED),$(LOCAL_SRC))
 LOCAL_C                     ?= $(wildcard *.c)
 LOCAL_CPP                   ?= $(wildcard *.cc *.cpp *.C)
-LOCAL_H                     ?= $(wildcard *.h *.H *.hpp)
+LOCAL_H                     ?= $(wildcard *.h *.H *.hpp *.hh)
 SFILES                      ?= $(wildcard *.S *.sx)
 #PREREQ_H                   += $(foreach dir,$(PREREQ_DIR),$(wildcard $(dir)/*.h))
 ALL_H                       += $(LOCAL_H) $(PREREQ_H)