diff --git a/init.lua b/init.lua
index f14b3ba..beeefb7 100644
--- a/init.lua
+++ b/init.lua
@@ -151,7 +151,7 @@ minetest.register_alias("pipeworks:pipe", "pipeworks:pipe_110000_empty")
 
 -- Unified Inventory categories integration
 
-if unified_inventory and unified_inventory.registered_categories then
+if minetest.global_exists("unified_inventory") and unified_inventory.registered_categories then
 	if not unified_inventory.registered_categories["automation"] then
 		unified_inventory.register_category("automation", {
 			symbol = "pipeworks:lua_tube000000",