diff --git a/upload.php b/upload.php
index df9d4e4..c4c124a 100644
--- a/upload.php
+++ b/upload.php
@@ -29,6 +29,12 @@ $mapId = generateMapId(); // the id of the map
 
 $map = $_FILES["map"]; // the file to upload
 $file = $map["tmp_name"]; // the temporary file path
+$size = $map["size"]; // the size of the file
+
+if ($size > 100000000) { // if the file is larger than 100MB
+  echo "The file is too large";
+  die();
+}
 
 if (!isZipFile($map["name"])) {
   echo "The file is not a zip file";