diff --git a/make/defs.mk b/make/defs.mk
index c3b33f1e..5edfc1dd 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -321,8 +321,7 @@ INSTALLED_SYSCFG            ?= $(addprefix $(INSTALL_SYSCFGDIR)/,$(SYSCFG_FILES)
 INSTALLATION_FILE_TYPES     += HDR
 BUILD_HDRDIR_BASE           ?= $(TOPDIR)/include
 BUILD_HDRDIR                ?= $(BUILD_HDRDIR_BASE)/$(HDRDIR_SCOPE_SUFFIX)
-SRC_H                       += $(filter %.h %.H %.hpp, $(SRC_ALL_CPP))
-BUILD_H                      = $(addprefix $(BUILD_HDRDIR)/,$(SRC_H))
+SRC_H                       += $(filter %.h %.H %.hpp %.hh, $(SRC_ALL_CPP))
 BUILD_HDR                   += $(addprefix $(BUILD_HDRDIR)/,$(SRC_H))
 INSTALL_HDRDIR              ?= $(PREFIX)/include
 INSTALLED_HDR               += $(addprefix $(INSTALL_HDRDIR)/,$(SRC_H))