diff --git a/functions/upgrade1.3.5to1.4.0.php b/functions/upgrade1.3.5to1.4.0.php
index 6976b09..d25dc46 100644
--- a/functions/upgrade1.3.5to1.4.0.php
+++ b/functions/upgrade1.3.5to1.4.0.php
@@ -10,15 +10,15 @@
 $db=new Db;
 $db->connect();
 
-echo "<hr/>Altering table mods<br/>";
+echo "<hr/>Altering table columns<br/>";
 
 // 1.4.0: mod version ranges
 // naturally, we assume user is using mysql.
-$addtype1=$db->execute("ALTER TABLE `mods` ADD COLUMN `loadertype` VARCHAR(32);");
-$addtype2=$db->execute("ALTER TABLE `builds` ADD COLUMN `loadertype` VARCHAR(32);");
+$addtype1=$db->execute("ALTER TABLE mods ADD COLUMN loadertype VARCHAR(32);");
+$addtype2=$db->execute("ALTER TABLE builds ADD COLUMN loadertype VARCHAR(32);");
 
 if (!$addtype||!$addtype) {
-    die("Couldn't add new columns loadertype to table `mods`! Are we already upgraded? <a href='/'>Click here to return to index</a>.");
+    die("Couldn't add new columns loadertype to table mods! Are we already upgraded? <a href='/'>Click here to return to index</a>.");
 }
 
 mkdir('../upgrade_work');
@@ -28,7 +28,7 @@
 require('modInfo.php');
 $mi = new modInfo();
 
-$mods=$db->query("SELECT id,filename FROM `mods` WHERE type='mod'");
+$mods=$db->query("SELECT id,filename FROM mods WHERE type='mod'");
 
 foreach ($mods as $mod) {
     $zip = new ZipArchive;
@@ -58,7 +58,7 @@
                 $modltq = $db->query("SELECT loadertype from mods where id = ".$mod['id']);
                 if ($modltq) {
                     if (sizeof($modltq)==1 && $modltq[0]['loadertype']===$loader_type) {
-                        echo 'mod id='.$mod['id'].' name='.$mod['name'].' already has loadertype='.$loader_type.'. skipping.<br/>';
+                        echo 'Skipping mod id='.$mod['id'].' name='.$mod['name'].' already has loadertype='.$loader_type.'<br/>';
                         continue;
                     }
                 }
@@ -66,7 +66,7 @@
                 $updatemodx = $db->execute("UPDATE mods SET loadertype = '".$loader_type."' where id = ".$mod['id']);
 
                 if ($updatemodx) {
-                    echo 'mod id='.$mod['id'].', name='.$mod['name'].' updated, loadertype='.$loader_type.".<br/>";
+                    echo 'Updated mod id='.$mod['id'].', name='.$mod['name'].', loadertype='.$loader_type.".<br/>";
                 } else {
                     echo 'failed to update mod id='.$mod['id'].' name='.$mod['name'];
                 }
@@ -81,16 +81,58 @@
 
 echo "<hr/>Updating modloader entries<br/>";
 
-$forges=$db->query("SELECT id,filename FROM `mods` WHERE type='forge'");
+$forges=$db->query("SELECT id,filename,loadertype FROM mods WHERE type='forge'");
 foreach ($forges as $forge) {
-    if (str_starts_with($forge['filename'], 'forge-')) {
-        $db->execute("UPDATE mods SET loadertype='forge' WHERE id='".$forge['id']."'");
-    }
-    else if (str_starts_with($forge['filename'], 'neoforge-')) {
-        $db->execute("UPDATE mods SET loadertype='neoforge' WHERE id='".$forge['id']."'");
+    if (empty($forge['loadertype'])) {
+        if (str_starts_with($forge['filename'], 'forge-')) {
+            $db->execute("UPDATE mods SET loadertype='forge' WHERE id='".$forge['id']."'");
+        }
+        else if (str_starts_with($forge['filename'], 'neoforge-')) {
+            $db->execute("UPDATE mods SET loadertype='neoforge' WHERE id='".$forge['id']."'");
+        }
+        else if (str_starts_with($forge['filename'], 'fabric-')) {
+            $db->execute("UPDATE mods SET loadertype='fabric' WHERE id='".$forge['id']."'");
+        } else {
+            error_log("unknown filename ".$forge['filename']);
+            echo "Unknown filename ".$forge['filename'];
+            continue; // idk what this is
+        }
+        echo "Updated ".$forge['filename']."<br/>";
+    } else {
+        echo "Skipping ".$forge['filename']." as it already has loadertype=".$forge['loadertype']."<br/>";
     }
-    else if (str_starts_with($forge['filename'], 'fabric-')) {
-        $db->execute("UPDATE mods SET loadertype='fabric' WHERE id='".$forge['id']."'");
+}
+
+echo "<hr/>Updating builds entries<br/>";
+
+$builds=$db->query("SELECT id,name,mods,loadertype FROM builds");
+
+foreach ($builds as $build) {
+    if (empty($build['loadertype'])) {
+        // now get the mod details
+        $mod_loadertype="";
+        foreach (explode(",", $build['mods']) as $id) {
+            $mod_loadertype = $db->query("SELECT id,loadertype FROM mods WHERE id = ".$id." AND type='forge'");
+            if ($mod_loadertype===FALSE || empty($mod_loadertype) || sizeof($mod_loadertype)!==1) {
+                continue;
+            }
+            // at this point we have a forge entry
+            $mod_loadertype=$mod_loadertype[0]['loadertype'];
+            break;
+        }
+        if (!empty($mod_loadertype)) {
+            $updateres = $db->execute("UPDATE builds SET loadertype = '".$mod_loadertype."' WHERE id = ".$build['id']);
+
+            if ($updateres===TRUE) {
+                echo "Updated ".$build['name']." = '".$mod_loadertype."'<br/>";
+            } else {
+                echo "Failed to update ".$build['name']."<br/>";
+            }
+        } else {
+            echo "Failed to update ".$build['name']."<br/>";
+        }
+    } else {
+        echo "Build ".$build['name']." already has loadertype=".$build['loadertype']."<br/>";
     }
 }