diff --git a/hwe/func_converter.php b/hwe/func_converter.php
index 6c452178..e59bed3f 100644
--- a/hwe/func_converter.php
+++ b/hwe/func_converter.php
@@ -465,7 +465,7 @@ function getTechLevel($tech):int{
 
 function TechLimit($startyear, $year, $tech) : bool {
 
-    $relYear = $startyear - $year;
+    $relYear = $year - $startyear;
 
     $relMaxTech = Util::valueFit(
         floor($relYear / 5) + 1,