diff --git a/Make.defaults b/Make.defaults
index a22a1b4..4c95e7b 100644
--- a/Make.defaults
+++ b/Make.defaults
@@ -83,7 +83,7 @@ GCCNEWENOUGH := $(shell ( [ $(GCCVERSION) -gt "4" ]           \
                                && [ $(GCCMINOR) -ge "7" ] ) ) \
                         && echo 1)
 ifeq ($(GCCNEWENOUGH),1)
-  CPPFLAGS += -DGNU_EFI_USE_MS_ABI -maccumulate-outgoing-args --std=c11
+  CPPFLAGS += --std=c11
 endif
 
 # Arch-specific compilation flags