diff --git a/render.c b/render.c
index 5e7ef233..ba70aee0 100644
--- a/render.c
+++ b/render.c
@@ -1110,6 +1110,8 @@ render_set_title(struct terminal *term, const char *_title)
 void
 render_refresh(struct terminal *term)
 {
+    assert(term->window->is_configured);
+
     if (term->window->frame_callback == NULL)
         grid_render(term);
     else
diff --git a/wayland.c b/wayland.c
index 4b419684..603eb441 100644
--- a/wayland.c
+++ b/wayland.c
@@ -505,6 +505,8 @@ xdg_surface_configure(void *data, struct xdg_surface *xdg_surface,
     struct wl_window *win = data;
     struct terminal *term = win->term;
 
+    win->is_configured = true;
+
     if (win->configure.is_activated)
         term_visual_focus_in(term);
     else
diff --git a/wayland.h b/wayland.h
index f802bcc7..fd0c36e2 100644
--- a/wayland.h
+++ b/wayland.h
@@ -99,6 +99,7 @@ struct wl_window {
 
     tll(const struct monitor *) on_outputs; /* Outputs we're mapped on */
 
+    bool is_configured;
     struct {
         bool is_activated;
         int width;