diff --git a/ril/libril/Android.mk b/ril/libril/Android.mk
index 79398670..b0f982d3 100644
--- a/ril/libril/Android.mk
+++ b/ril/libril/Android.mk
@@ -22,18 +22,21 @@ LOCAL_SHARED_LIBRARIES := \
 LOCAL_STATIC_LIBRARIES := \
     libprotobuf-c-nano-enable_malloc \
 
+LOCAL_CFLAGS :=
+
 ifeq ($(SIM_COUNT), 2)
+    LOCAL_CFLAGS += -DANDROID_MULTI_SIM
     LOCAL_CFLAGS += -DANDROID_SIM_COUNT_2
 endif
 
 ifneq ($(filter xmm6262 xmm6360,$(BOARD_MODEM_TYPE)),)
-LOCAL_CFLAGS := -DMODEM_TYPE_XMM6262
+LOCAL_CFLAGS += -DMODEM_TYPE_XMM6262
 endif
 ifeq ($(BOARD_MODEM_TYPE),xmm6260)
-LOCAL_CFLAGS := -DMODEM_TYPE_XMM6260
+LOCAL_CFLAGS += -DMODEM_TYPE_XMM6260
 endif
 ifneq ($(filter m7450 mdm9x35 ss333 tss310 xmm7260,$(BOARD_MODEM_TYPE)),)
-LOCAL_CFLAGS := -DSAMSUNG_NEXT_GEN_MODEM
+LOCAL_CFLAGS += -DSAMSUNG_NEXT_GEN_MODEM
 endif
 
 ifeq ($(BOARD_MODEM_NEEDS_VIDEO_CALL_FIELD), true)