diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/NetworkUtils.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/NetworkUtils.java
index b60189ab7..69fe4f714 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/NetworkUtils.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/NetworkUtils.java
@@ -178,7 +178,7 @@ public final class NetworkUtils {
     public static String detectFileName(URL url) throws IOException {
         HttpURLConnection conn = resolveConnection(createConnection(url));
         int code = conn.getResponseCode();
-        if (code == 404)
+        if (code / 100 == 4)
             throw new FileNotFoundException();
         if (code / 100 != 2)
             throw new IOException(url + ": response code " + conn.getResponseCode());