diff --git a/include/image.mk b/include/image.mk
index 275a0adcac..e5b52d0e97 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -184,6 +184,7 @@ endef
 # $(4) extra DTC flags
 define Image/BuildDTB
 	$(TARGET_CROSS)cpp -nostdinc -x assembler-with-cpp \
+		$(DTS_CPPFLAGS) \
 		-I$(DTS_DIR) \
 		-I$(DTS_DIR)/include \
 		-I$(LINUX_DIR)/include/ \