diff --git a/bzgold2/prototypes/tech-updates.lua b/bzgold2/prototypes/tech-updates.lua
index ad6b5ab..a5a738c 100644
--- a/bzgold2/prototypes/tech-updates.lua
+++ b/bzgold2/prototypes/tech-updates.lua
@@ -21,6 +21,8 @@ end
 util.add_unlock("processing-unit", "cpu")
 util.add_unlock("processing-unit", "mainboard")
 
-util.add_prerequisite("coal-liquefaction", "catalysis")
-util.remove_prerequisite("coal-liquefaction", "production-science-pack")
-util.remove_prerequisite("coal-liquefaction", "advanced-oil-processing")
+if settings.startup["bzgold-catalysis"].value == true then
+  util.add_prerequisite("coal-liquefaction", "catalysis")
+  util.remove_prerequisite("coal-liquefaction", "production-science-pack")
+  util.remove_prerequisite("coal-liquefaction", "advanced-oil-processing")
+end