diff --git a/angelsrefining/changelog.txt b/angelsrefining/changelog.txt
index f7f7c6896..b6bbeaa66 100644
--- a/angelsrefining/changelog.txt
+++ b/angelsrefining/changelog.txt
@@ -9,6 +9,7 @@ Date: xx.xx.xxxx
     - Added custom error message for when trying to insert invalid items into a barreling pump (933)
     - Changed Crystal catalyst recipe to require Crystallizer 2 (943)
     - Removed Crystal catalyst from Bob's gem ore crystallization recipes (943)
+    - Changed the Recipe Builder to make it easier for other mods to add their own materials (950)
 ---------------------------------------------------------------------------------------------------
 Version: 0.12.4
 Date: 23.02.2023
diff --git a/angelsrefining/prototypes/recipe-builder.lua b/angelsrefining/prototypes/recipe-builder.lua
index 22051a1e8..fbcc9668a 100644
--- a/angelsrefining/prototypes/recipe-builder.lua
+++ b/angelsrefining/prototypes/recipe-builder.lua
@@ -34,7 +34,9 @@ end
 RB.set_fallback = function(i_type, i_name, fb_list, i_condition) -- i_type either "item" or "fluid", i_name the name of the item, fb_list a table containing subtables { name, multiplier, condition } where item_name is a string, multiplier is a positive number (defaults to 1), and condition is a function taking i_type and i_name as arguments and returning a boolean (defaults to return true) can also be formatted { name = name, multiplier = multiplier, condition = condition }, condition (optional) is like the condition field in a subtable of fb_list but for i_name
   local parent = fallbacks[i_type]
   if parent then
-    if check_raw_for(i_type, i_name) and (not i_condition or i_condition(i_type, i_name)) then
+    if parent[i_name] ~= nil then
+      -- fallback already exists
+    elseif check_raw_for(i_type, i_name) and (not i_condition or i_condition(i_type, i_name)) then
       parent[i_name] = nil
     else
       local sentinel = true