diff --git a/MozillaThunderbird.changes b/MozillaThunderbird.changes
index 5722a7d..77a6889 100644
--- a/MozillaThunderbird.changes
+++ b/MozillaThunderbird.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Dec 28 20:20:30 UTC 2021 - Bjørn Lie <bjorn.lie@gmail.com>
+
+- Add mozilla-bmo1745560.patch: Fix build against wayland 1.20.
+
 -------------------------------------------------------------------
 Fri Dec 17 14:19:48 UTC 2021 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/MozillaThunderbird.spec b/MozillaThunderbird.spec
index 4be215e..346d8be 100644
--- a/MozillaThunderbird.spec
+++ b/MozillaThunderbird.spec
@@ -207,6 +207,7 @@ Patch28:        mozilla-libavcodec58_91.patch
 Patch29:        mozilla-silence-no-return-type.patch
 Patch30:        mozilla-bmo531915.patch
 Patch31:        mozilla-bmo1724679.patch
+Patch32:        mozilla-bmo1745560.patch
 %endif
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 PreReq:         /bin/sh
@@ -309,6 +310,7 @@ fi
 %patch29 -p1
 %patch30 -p1
 %patch31 -p1
+%patch32 -p1
 %endif
 
 %build
diff --git a/mozilla-bmo1745560.patch b/mozilla-bmo1745560.patch
new file mode 100644
index 0000000..3f199d1
--- /dev/null
+++ b/mozilla-bmo1745560.patch
@@ -0,0 +1,14 @@
+diff --git a/widget/gtk/mozwayland/mozwayland.c b/widget/gtk/mozwayland/mozwayland.c
+--- a/widget/gtk/mozwayland/mozwayland.c
++++ b/widget/gtk/mozwayland/mozwayland.c
+@@ -200,3 +200,10 @@
+ 
+ MOZ_EXPORT void wl_list_insert_list(struct wl_list* list,
+                                     struct wl_list* other) {}
++
++MOZ_EXPORT struct wl_proxy* wl_proxy_marshal_flags(
++    struct wl_proxy* proxy, uint32_t opcode,
++    const struct wl_interface* interface, uint32_t version, uint32_t flags,
++    ...) {
++  return NULL;
++}