diff --git a/src/main/java/cc/irori/hyinit/mixin/HyinitClassLoader.java b/src/main/java/cc/irori/hyinit/mixin/HyinitClassLoader.java
index a67a2ba..5cd09a0 100644
--- a/src/main/java/cc/irori/hyinit/mixin/HyinitClassLoader.java
+++ b/src/main/java/cc/irori/hyinit/mixin/HyinitClassLoader.java
@@ -233,7 +233,11 @@ private Class<?> tryLoadClass(String name, boolean allowFromParent) throws Class
             }
         }
 
-        return defineClass(name, input, 0, input.length, metadata.codeSource);
+        try {
+            return defineClass(name, input, 0, input.length, metadata.codeSource);
+        } catch (NoClassDefFoundError e) {
+            throw new ClassNotFoundException(name, e);
+        }
     }
 
     public byte[] getClassByteArray(String name, boolean runTransformers) throws IOException {