diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
index a497c2a151..86d358044a 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
@@ -280,6 +280,7 @@ public class DefaultLauncher extends Launcher {
         if (instance.hasComponent(GameComponentType.CLEANROOM)) {
             libraryClasspath.removeIf(c -> c.contains("2.9.4-nightly-20150209"));
             libraryClasspath.removeIf(c -> c.contains("platform-3.4.0"));
+            libraryClasspath.removeIf(c -> c.contains("icu4j-core-mojang"));
         }
 
         Path jar = instance.getInstanceJarFile();