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-rw-r--r--interface-ip.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/interface-ip.c b/interface-ip.c
index 56f8bd9..6906d62 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -459,7 +459,7 @@ interface_set_prefix_address(struct interface *iface, bool add,
if (assignment->enabled) {
time_t now = system_get_rtime();
addr.preferred_until = now;
- if (addr.valid_until - now > 7200)
+ if (!addr.valid_until || addr.valid_until - now > 7200)
addr.valid_until = now + 7200;
system_add_address(l3_downlink, &addr);
}