diff --git a/src/handshake.c b/src/handshake.c
index f6b16c31..f1bc19e0 100644
--- a/src/handshake.c
+++ b/src/handshake.c
@@ -1268,6 +1268,7 @@ static struct pmksa *handshake_state_steal_pmksa(struct handshake_state *s)
 
 	pmksa = l_new(struct pmksa, 1);
 	pmksa->expiration = s->expiration;
+	s->expiration = 0;
 	memcpy(pmksa->spa, s->spa, sizeof(s->spa));
 	memcpy(pmksa->aa, s->aa, sizeof(s->aa));
 	memcpy(pmksa->ssid, s->ssid, s->ssid_len);