diff --git a/modules/gridmap/grid_map.cpp b/modules/gridmap/grid_map.cpp
index 4ac143c7ff99..6f493f48e38e 100644
--- a/modules/gridmap/grid_map.cpp
+++ b/modules/gridmap/grid_map.cpp
@@ -267,6 +267,7 @@ void GridMap::set_mesh_library(const Ref<MeshLibrary> &p_mesh_library) {
 	}
 
 	_recreate_octant_data();
+	emit_signal(CoreStringNames::get_singleton()->changed);
 }
 
 Ref<MeshLibrary> GridMap::get_mesh_library() const {