diff --git a/index.php b/index.php
index 6f9ca88..1e7c0e1 100755
--- a/index.php
+++ b/index.php
@@ -95,6 +95,7 @@ function storeFile($name, $tmpFile, $formatted = false)
     global $ID_LENGTH;
     global $HTTP_PROTO;
     global $DOWNLOAD_URL;
+    global $MAX_FILESIZE;
 
 
     //create folder, if it doesn't exist
@@ -103,6 +104,13 @@ function storeFile($name, $tmpFile, $formatted = false)
         mkdir($STORE_PATH, 0750, true); //TODO: error handling
     }
 
+    //check file size
+    if (filesize($tmpFile) > $MAX_FILESIZE * 1024 * 1024)
+    {
+        header("HTTP/1.0 507 Max File Size Exceeded");
+        return;
+    }
+
     $ext = getExtension($name);
     $id = rndStr($ID_LENGTH);
     $basename = $id . '.' . $ext;
@@ -128,7 +136,7 @@ function storeFile($name, $tmpFile, $formatted = false)
     else
     {
         //TODO: proper error handling
-        printf("An error occurred while uploading file.");
+        header("HTTP/1.0 520 Unknown Error");
     }
 }