diff --git a/wlroots/ffi_build.py b/wlroots/ffi_build.py
index 8a0a0747..b9985ed6 100644
--- a/wlroots/ffi_build.py
+++ b/wlroots/ffi_build.py
@@ -2263,6 +2263,7 @@ def has_xwayland() -> bool:
     } events;
 
     void *data;
+    ...;
 };
 
 struct wlr_session_lock_surface_v1_state {
diff --git a/wlroots/wlr_types/session_lock_v1.py b/wlroots/wlr_types/session_lock_v1.py
index 6c25d6f6..e599e3f7 100644
--- a/wlroots/wlr_types/session_lock_v1.py
+++ b/wlroots/wlr_types/session_lock_v1.py
@@ -65,7 +65,6 @@ class SessionLockSurfaceV1(PtrHasData):
 
     def __init__(self, ptr) -> None:
         self._ptr = ffi.cast("struct wlr_session_lock_surface_v1 *", ptr)
-        self.map_event = Signal(ptr=ffi.addressof(self._ptr.events.map))
         self.destroy_event = Signal(ptr=ffi.addressof(self._ptr.events.destroy))
 
     @property