diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/ModAdviser.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/ModAdviser.java
index 837bdbcb02..e890c332fd 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/ModAdviser.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/ModAdviser.java
@@ -19,7 +19,7 @@
 
 import org.jackhuang.hmcl.util.Lang;
 
-import java.io.File;
+import java.nio.file.FileSystems;
 import java.util.List;
 
 /**
@@ -74,7 +74,7 @@ enum ModSuggestion {
             "optionsof.txt" /* OptiFine */,
             "journeymap" /* JourneyMap */,
             "optionsshaders.txt",
-            "mods" + File.separator + "VoxelMods");
+            "mods/VoxelMods");
 
     static ModAdviser.ModSuggestion suggestMod(String fileName, boolean isDirectory) {
         if (match(MODPACK_BLACK_LIST, fileName, isDirectory))
@@ -88,7 +88,7 @@ static ModAdviser.ModSuggestion suggestMod(String fileName, boolean isDirectory)
     static boolean match(List<String> l, String fileName, boolean isDirectory) {
         for (String s : l)
             if (isDirectory) {
-                if (fileName.startsWith(s + File.separator))
+                if (fileName.startsWith(s + "/") || fileName.startsWith(s + FileSystems.getDefault().getSeparator()))
                     return true;
             } else {
                 if (s.startsWith("regex:")) {