--- old/src/hotspot/share/classfile/javaClasses.cpp	2018-04-10 16:58:48.425013000 +0200
+++ new/src/hotspot/share/classfile/javaClasses.cpp	2018-04-10 16:58:47.976981000 +0200
@@ -4126,7 +4126,7 @@
     ss.print("\"%s\" (instance of %s", name, loader->klass()->external_name());
     seperator = ", ";
   } else {
-    ss.print("%s", loader->klass()->external_name());
+    ss.print("instance of %s", loader->klass()->external_name());
     seperator = " (";
   }