diff --git a/mods/unified_inventory/api.lua b/mods/unified_inventory/api.lua
index 090aec3d..3eaf4a9c 100755
--- a/mods/unified_inventory/api.lua
+++ b/mods/unified_inventory/api.lua
@@ -24,12 +24,22 @@ minetest.after(0.01, function()
 
 						for _,chk in pairs(recipe.items) do
 							local groupchk = string.find(chk, "group:")
-							if (not groupchk and not minetest.registered_items[chk])
-							  or (groupchk and not unified_inventory.get_group_item(string.gsub(chk, "group:", "")).item) then
+							if groupchk then
+								for _,groupname in pairs(string.gsub(chk, "group:", ""):split(",")) do
+									if not unified_inventory.get_group_item(groupname).item then
+										unknowns = true
+										if minetest.setting_getbool("show_unknown_craftrecipes") then
+											minetest.log("error", "Recipe for item " .. recipe.output .. " contains unknown group " .. groupname)
+										end
+										break
+									end
+								end
+							elseif not minetest.registered_items[chk] then
 								unknowns = true
 								if minetest.setting_getbool("show_unknown_craftrecipes") then
 									minetest.log("error", "Recipe for item " .. recipe.output .. " contains unknown item " .. chk)
 								end
+								break
 							end
 						end