diff --git a/net/bird2/patches/000-ospf-bus-error.patch b/net/bird2/patches/000-ospf-bus-error.patch
index 7c56a82947..e1e631fedf 100644
--- a/net/bird2/patches/000-ospf-bus-error.patch
+++ b/net/bird2/patches/000-ospf-bus-error.patch
@@ -3,8 +3,24 @@ From: Matt Reeve <matt@mreeve.com>
 Date: Tue, 10 Aug 2021 12:41:04 +0100
 Subject: [PATCH] Fix bus error on OSPF on IPQ806X
 
----
+On a Netgear R7800, if ospf v2 or v3 is configured in bird.conf, it fails
+to start with this error:
 
+    kernel: Alignment trap: not handling instruction f44c0a1f at [<00035848>]
+    kernel: Unhandled fault: alignment exception (0x801) at 0x007e0624
+
+The problem is due to a struct not being properly aligned on the ARMv7
+architecture.
+
+This patch fixes the problem by adding the "PACKED" macro to the affected
+struct. Note that upstream may later fix this in another way, in which
+case this patch will not be required.
+
+Upstream-Status: not submitted. As of 2.19.2 the structure still carries
+no alignment attribute.
+
+Signed-off-by: Matt Reeve <matt@mreeve.com>
+---
 --- a/proto/ospf/topology.h
 +++ b/proto/ospf/topology.h
 @@ -41,7 +41,7 @@ struct top_hash_entry