diff --git a/src/java_lang_Class.cc b/src/java_lang_Class.cc
index 4fe3191..68b83f2 100644
--- a/src/java_lang_Class.cc
+++ b/src/java_lang_Class.cc
@@ -327,7 +327,7 @@
   if (o == NULL) {
     return JNI_FALSE;
   }
-  return Object::InstanceOf(o, c) ? JNI_TRUE : JNI_FALSE;
+  return o->InstanceOf(c) ? JNI_TRUE : JNI_FALSE;
 }
 
 jboolean Class_isInterface(JNIEnv* env, jobject javaThis) {