diff -r 4242e35767b5 -r 1f7f707c1aa9 src/hotspot/share/classfile/defaultMethods.cpp
--- a/src/hotspot/share/classfile/defaultMethods.cpp	Wed Oct 23 17:35:32 2019 +0200
+++ b/src/hotspot/share/classfile/defaultMethods.cpp	Wed Oct 23 18:34:25 2019 +0200
@@ -146,7 +146,7 @@
       return interface_index() >= number_of_interfaces();
     }
     InstanceKlass* interface_at(int index) {
-      return InstanceKlass::cast(_class->local_interfaces()->at(index));
+      return _class->local_interfaces()->at(index);
     }
     InstanceKlass* next_super() { return _class->java_super(); }
     InstanceKlass* next_interface() {