diff --git a/lignumis/data.lua b/lignumis/data.lua
index 3e7d4f0..4456e68 100644
--- a/lignumis/data.lua
+++ b/lignumis/data.lua
@@ -25,7 +25,7 @@ Lignumis = {
     }
 }
 
-if settings.startup["lignumis-technology-progression"].value then
+if not settings.startup["lignumis-technology-progression"].value then
     Lignumis.science_pack_whitelist = {}
 end
 
diff --git a/lignumis/prototypes/integrations/vanilla.lua b/lignumis/prototypes/integrations/vanilla.lua
index 7d4229a..8e64ad0 100644
--- a/lignumis/prototypes/integrations/vanilla.lua
+++ b/lignumis/prototypes/integrations/vanilla.lua
@@ -275,15 +275,15 @@ if not mods["planet-picker"] then
     local production_science_pack_technology = Technology:new("production-science-pack")
     production_science_pack_technology:replacePrerequisite("advanced-material-processing-2", "space-platform-thruster")
     production_science_pack_technology:addIngredients({ "space-science-pack" })
-    if not settings.startup["lignumis-technology-progression"].value then
-        production_science_pack_technology:removeIngredients({ "wood-science-pack", "steam-science-pack" })
+    if settings.startup["lignumis-technology-progression"].value then
+        production_science_pack_technology:addIngredients({ "wood-science-pack", "steam-science-pack" })
     end
 
     local utility_science_pack_technology = Technology:new("utility-science-pack")
     utility_science_pack_technology:setPrerequisites({ "space-platform-thruster" })
     utility_science_pack_technology:addIngredients({ "space-science-pack" })
-    if not settings.startup["lignumis-technology-progression"].value then
-        utility_science_pack_technology:removeIngredients({ "wood-science-pack", "steam-science-pack" })
+    if settings.startup["lignumis-technology-progression"].value then
+        utility_science_pack_technology:addIngredients({ "wood-science-pack", "steam-science-pack" })
     end
 end