diff --git a/Product/build/user.object.Makefile b/Product/build/user.object.Makefile
index 1d9dd7303..6a021016c 100755
--- a/Product/build/user.object.Makefile
+++ b/Product/build/user.object.Makefile
@@ -37,7 +37,7 @@ PLAT_ARM64_SRCS	:= $(PLAT_LINUX_SRCS)
 # gcc CFLAGS
 COMMON_CFLAGS			:= -I../../Common -I../../Platform/common -I../../Product/common -DOBJECT_DEMO=1
 PLAT_LINUX_CFLAGS		+= $(COMMON_CFLAGS)
-PLAT_ARM64_CFLAGS		+= $(COMMON_CFLAGS)
+PLAT_ARM64_CFLAGS		+= $(COMMON_CFLAGS) -D_GNU_SOURCE -D__USE_XOPEN
 
 PLAT_ARM64_LDFLAGS      := -L ../../Platform/build/debug
 PLAT_LINUX_LDFLAGS      := $(PLAT_ARM64_LDFLAGS)