diff --git a/LauncherAPI/src/main/java/pro/gravit/launcher/base/profiles/ClientProfileBuilder.java b/LauncherAPI/src/main/java/pro/gravit/launcher/base/profiles/ClientProfileBuilder.java
index 3b156f50..2839dc03 100644
--- a/LauncherAPI/src/main/java/pro/gravit/launcher/base/profiles/ClientProfileBuilder.java
+++ b/LauncherAPI/src/main/java/pro/gravit/launcher/base/profiles/ClientProfileBuilder.java
@@ -79,6 +79,7 @@ public ClientProfileBuilder(ClientProfile profile) {
         this.loadNatives = new ArrayList<>(profile.getLoadNatives());
         this.properties = new HashMap<>(profile.getProperties());
         this.servers = new ArrayList<>(profile.getServers());
+        this.classLoaderConfig = profile.getClassLoaderConfig();
         this.flags = new ArrayList<>(profile.getFlags());
         this.recommendJavaVersion = profile.getRecommendJavaVersion();
         this.minJavaVersion = profile.getMinJavaVersion();