diff --git a/changelog.txt b/changelog.txt
index 92fd05c..0621323 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.3.7
+Date: 2021-02-15
+  Changes:
+    - Loose compabitility with IR2
+---------------------------------------------------------------------------------------------------
 Version: 0.3.6
 Date: 2021-02-13
   Changes:
diff --git a/info.json b/info.json
index bc6adb0..e3cb46c 100644
--- a/info.json
+++ b/info.json
@@ -1,6 +1,6 @@
 {
     "name": "bzsilicon",
-    "version": "0.3.6",
+    "version": "0.3.7",
     "factorio_version": "1.1",
     "title": "Silica & Silicon",
     "author": "Brevven",
diff --git a/recipe-updates.lua b/recipe-updates.lua
index a7f5822..f650e56 100644
--- a/recipe-updates.lua
+++ b/recipe-updates.lua
@@ -31,13 +31,18 @@ util.replace_ingredient("green-wire", "electronic-circuit", "silicon")
 util.replace_ingredient("red-wire", "copper-cable", "optical-fiber")
 util.replace_ingredient("red-wire", "electronic-circuit", "silicon")
 
-util.add_ingredient("arithmetic-combinator", "silicon", 1);
-util.add_ingredient("arithmetic-combinator", "optical-fiber", 1);
-util.add_ingredient("constant-combinator", "silicon", 1);
-util.add_ingredient("constant-combinator", "optical-fiber", 1);
-util.add_ingredient("decider-combinator", "silicon", 1);
-util.add_ingredient("decider-combinator", "optical-fiber", 1);
-util.add_ingredient("programmable-speaker", "optical-fiber", 1);
+if not mods["IndustrialRevolution"] then
+  util.add_ingredient("arithmetic-combinator", "silicon", 1)
+  util.add_ingredient("constant-combinator", "silicon", 1)
+  util.add_ingredient("decider-combinator", "silicon", 1)
+else
+  util.add_prerequisite("circuit-network", "fiber-optics")
+end
+
+util.add_ingredient("arithmetic-combinator", "optical-fiber", 1)
+util.add_ingredient("constant-combinator", "optical-fiber", 1)
+util.add_ingredient("decider-combinator", "optical-fiber", 1)
+util.add_ingredient("programmable-speaker", "optical-fiber", 1)
 
 util.add_prerequisite("circuit-network", "fiber-optics")
 util.add_prerequisite("circuit-network", util.silicon_processing)
diff --git a/util.lua b/util.lua
index a469e0e..b731c6b 100644
--- a/util.lua
+++ b/util.lua
@@ -37,6 +37,11 @@ end
 
 function add_ingredient(recipe, ingredient, quantity)
   if recipe ~= nil and recipe.ingredients ~= nil then
+    for _, existing in ipairs(recipe.ingredients) do 
+      if ingredient == existing.name or ingredient == existing[1] then
+        return
+      end
+    end
     table.insert(recipe.ingredients, {ingredient, quantity})
   end
 end