diff --git a/changelog.txt b/changelog.txt
index 6309f81..41282bf 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -16,6 +16,7 @@ Date: ???
     - Added py.find_latest_undo_action to find the latest undo action referencing a supplied entity
     - Fixed that reproductive complex had extremely small alt-mode icons. Resolves https://github.com/pyanodon/pybugreports/issues/1377
     - Added py.transfer_stack, py.transfer_stack_to_cursor, py.transfer_cursor_to_stack, and py.transfer_inventory_items
+    - Fixed that TECHNOLOGY:replace_prereq would not properly function
 ---------------------------------------------------------------------------------------------------
 Version: 3.0.41
 Date: 2025-12-28
diff --git a/lib/metas/technology.lua b/lib/metas/technology.lua
index c3e60e6..2b01efd 100644
--- a/lib/metas/technology.lua
+++ b/lib/metas/technology.lua
@@ -81,9 +81,9 @@ end
 ---@return data.TechnologyPrototype self
 ---@return boolean success
 metas.replace_prereq = function(self, old, new)
-    local _, success = self.remove_prereq(old)
+    local _, success = self:remove_prereq(old)
     if success then
-        return self.add_prereq(new) -- conditional on success of add_prereq
+        return self:add_prereq(new) -- conditional on success of add_prereq
     else
         return self, false -- DNE, do not add
     end