diff --git a/make/defs-cpp.mk b/make/defs-cpp.mk
index b8509bb3..4f21f4cd 100644
--- a/make/defs-cpp.mk
+++ b/make/defs-cpp.mk
@@ -192,14 +192,14 @@ SRC_UNHEADERED              += $(filter-out $(SRC_HEADERED),$(LOCAL_SRC))
 LOCAL_C                     ?= $(wildcard *.c)
 LOCAL_CPP                   ?= $(wildcard *.cc *.cpp *.C)
 LOCAL_H                     ?= $(wildcard *.h *.H *.hpp)
-SFILES                      ?= $(wildcard *.S)
+SFILES                      ?= $(wildcard *.S *.sx)
 #PREREQ_H                   += $(foreach dir,$(PREREQ_DIR),$(wildcard $(dir)/*.h))
 ALL_H                       += $(LOCAL_H) $(PREREQ_H)
 SRC_ALL_CPP                 += $(LOCAL_C) $(LOCAL_CPP) $(LOCAL_H)
 SRC_C                       += $(filter %.c, $(SRC_ALL_CPP))
 SRC_CPP                     += $(filter %.cc %.cpp %.C, $(SRC_ALL_CPP))
 OBJ                         += $(addprefix $(FLAVOUR_PREFIX),$(patsubst %.C,%.o,$(patsubst %.cpp,%.o,$(patsubst %.cc,%.o,$(patsubst %.c,%.o,$(filter %.c %.cpp %.cc %.C, $(SRC_ALL_CPP)))))))
-OBJ                         += $(addprefix $(FLAVOUR_PREFIX),$(patsubst %.S,%.o,$(SFILES)))
+OBJ                         += $(addprefix $(FLAVOUR_PREFIX),$(patsubst %.sx,%.o,$(patsubst %.S,%.o,$(SFILES))))
 
 #PREREQ_C                   += $(foreach dir,$(PREREQ_DIR),$(wildcard $(dir)/*.c))
 #PREREQ_CPP                 += $(foreach dir,$(PREREQ_DIR),$(wildcard $(dir)/*.c)) \