diff --git a/commands/mem.c b/commands/mem.c
index 73bf915..8df5f0a 100644
--- a/commands/mem.c
+++ b/commands/mem.c
@@ -418,7 +418,7 @@
 	char *sourcefile = DEVMEM;
 	char *destfile = DEVMEM;
 	int sourcefd, destfd;
-	int mode = O_RWSIZE_1;
+	int mode = 0;
 	struct stat statbuf;
 	int ret = 0;