diff --git a/gdk/wayland/gdkdisplay-wayland.c b/gdk/wayland/gdkdisplay-wayland.c
index 67fa059e99..da0b9e8c0d 100644
--- a/gdk/wayland/gdkdisplay-wayland.c
+++ b/gdk/wayland/gdkdisplay-wayland.c
@@ -1082,6 +1082,9 @@ gdk_wayland_display_set_cursor_theme (GdkDisplay *display,
   g_assert (display_wayland);
   g_assert (display_wayland->shm);
 
+  if (size == 0)
+    size = 24;
+
   if (g_strcmp0 (name, display_wayland->cursor_theme_name) == 0 &&
       display_wayland->cursor_theme_size == size)
     return;