diff --git a/src/rx/rx.c b/src/rx/rx.c
index 611ca1dd6a..c90a27141c 100644
--- a/src/rx/rx.c
+++ b/src/rx/rx.c
@@ -6308,7 +6308,7 @@ mtuout:
 	rxi_SetPeerMtu(conn->peer, 0, 0, newmtu);
 
 	/* clean up */
-	conn->lastPacketSize = 0;
+	conn->lastPacketSize = conn->lastPacketSizeSeq = 0;
 
 	/* needed so ResetCall doesn't clobber us. */
 	call->MTU = conn->peer->ifMTU;