diff --git a/inventory_management.lua b/inventory_management.lua
index b8ee9d6..9d70477 100644
--- a/inventory_management.lua
+++ b/inventory_management.lua
@@ -3,8 +3,10 @@ airutils.modname = core.get_current_modname()
 
 --function to format formspec for mineclone. In case of minetest, just returns an empty string
 function airutils.get_itemslot_bg(a, b, c, d)
-    if mcl_formspec then
-        return mcl_formspec.get_itemslot_bg(a,b,c,d)
+    if airutils.is_mcl then
+        if mcl_formspec then
+            return mcl_formspec.get_itemslot_bg(a,b,c,d)
+        end
     end
     return ""
 end
diff --git a/mod.conf b/mod.conf
index 3b79d67..d32ef5d 100644
--- a/mod.conf
+++ b/mod.conf
@@ -2,4 +2,4 @@ name = airutils
 title=AirUtils
 description=A lib for airplanes and some useful tools
 author=apercy
-optional_depends=player_api, emote, climate_api, biofuel, signs_lib, skinsdb
+optional_depends=player_api, mcl_formspec, mcl_player, emote, climate_api, biofuel, signs_lib, skinsdb