diff --git a/carbon-recipe.lua b/carbon-recipe.lua
index 4fc99d6..3fd3fd3 100644
--- a/carbon-recipe.lua
+++ b/carbon-recipe.lua
@@ -407,6 +407,7 @@ data:extend({
   {
     type = "recipe",
     name = "nanotubes",
+    main_product = "nanotubes",
     icon = "__bzcarbon__/graphics/icons/nanotube.png",
     icon_size = 128,
     category = "chemistry",
diff --git a/compatibility/crafting-efficiency.lua b/compatibility/crafting-efficiency.lua
index e844c62..189987b 100644
--- a/compatibility/crafting-efficiency.lua
+++ b/compatibility/crafting-efficiency.lua
@@ -20,7 +20,8 @@ if mods["crafting-efficiency-2"] then
 
   for i, recipe in pairs(recipes) do
     -- add remaining recipes with direct items to find the icons
-    if data.raw.recipe[recipe] and data.raw.item[recipe] and not eff_data[recipe] then
+    if data.raw.recipe[recipe] and data.raw.item[recipe] and not eff_data[recipe] and 
+    (data.raw.recipe[recipe].main_product or util.get_result_count(recipe) == 1) then
       eff_data[recipe] = {
         name = recipe.." efficiency",
         max = 15,