diff --git a/net/slirp.c b/net/slirp.c
index 124e953d9c..ce27eed0b2 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -529,7 +529,8 @@ static int slirp_smb(SlirpState* s, const char *exported_dir,
             "state directory=%s\n"
             "log file=%s/log.smbd\n"
             "smb passwd file=%s/smbpasswd\n"
-            "security = share\n"
+            "security = user\n"
+            "map to guest = Bad User\n"
             "[qemu]\n"
             "path=%s\n"
             "read only=no\n"