diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1082460daca7..155138d8ec8b 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1593,11 +1593,10 @@ unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
 			est_mtu = mtu;
 			peer->pmtu_learned = mtu;
 			peer->pmtu_expires = pmtu_expires;
+			atomic_inc(&__rt_peer_genid);
 		}
 
 		inet_putpeer(peer);
-
-		atomic_inc(&__rt_peer_genid);
 	}
 	return est_mtu ? : new_mtu;
 }