diff --git a/gdk/broadway/broadway-protocol.h b/gdk/broadway/broadway-protocol.h
index a343617d85..c098fdf8de 100644
--- a/gdk/broadway/broadway-protocol.h
+++ b/gdk/broadway/broadway-protocol.h
@@ -160,7 +160,7 @@ typedef struct {
 typedef struct {
   BroadwayRequestBase base;
   guint32 id;
-  char name[34];
+  char name[36];
   guint32 width;
   guint32 height;
 } BroadwayRequestUpdate;
diff --git a/gdk/broadway/gdkbroadway-server.c b/gdk/broadway/gdkbroadway-server.c
index 2e3346954b..cb9bdf4664 100644
--- a/gdk/broadway/gdkbroadway-server.c
+++ b/gdk/broadway/gdkbroadway-server.c
@@ -550,7 +550,7 @@ create_random_shm (char *name)
 static const cairo_user_data_key_t gdk_broadway_shm_cairo_key;
 
 typedef struct {
-  char name[34];
+  char name[36];
   void *data;
   gsize data_size;
 } BroadwayShmSurfaceData;
@@ -610,7 +610,7 @@ _gdk_broadway_server_window_update (GdkBroadwayServer *server,
   g_assert (data != NULL);
 
   msg.id = id;
-  memcpy (msg.name, data->name, 34);
+  memcpy (msg.name, data->name, 36);
   msg.width = cairo_image_surface_get_width (surface);
   msg.height = cairo_image_surface_get_height (surface);