diff --git a/lib/romlib/Makefile b/lib/romlib/Makefile
index 60c1458..cec9404 100644
--- a/lib/romlib/Makefile
+++ b/lib/romlib/Makefile
@@ -15,7 +15,7 @@
 WRAPPER_DIR = ../../$(BUILD_PLAT)/libwrapper
 LIBS        = -lmbedtls -lfdt -lc
 INC         = $(INCLUDES:-I%=-I../../%)
-PPFLAGS     = $(INC) $(DEFINES) -P -D__ASSEMBLY__ -D__LINKER__ -MD -MP -MT $(BUILD_DIR)/romlib.ld
+PPFLAGS     = $(INC) $(DEFINES) -P -x assembler-with-cpp -D__LINKER__ -MD -MP -MT $(BUILD_DIR)/romlib.ld
 OBJS        = $(BUILD_DIR)/jmptbl.o $(BUILD_DIR)/init.o
 MAPFILE     = ../../$(BUILD_PLAT)/romlib/romlib.map