diff --git a/bsp/abstract-machine/Makefile b/bsp/abstract-machine/Makefile
index eb227e9..060f0f8 100644
--- a/bsp/abstract-machine/Makefile
+++ b/bsp/abstract-machine/Makefile
@@ -6,6 +6,7 @@ RTCONFIG_H = rtconfig.h
 NAME = rtthread
 SRCS = $(shell find src -name "*.c")
 CFLAGS += -DHAVE_CCONFIG_H -D__RTTHREAD__
+CFLAGS += -Wno-nonnull-compare
 LDFLAGS += extra.ld
 -include $(FILE_MK)
 include $(AM_HOME)/Makefile