diff --git a/vm/interp/Stack.cpp b/vm/interp/Stack.cpp
index 9ef92c7..1433f13 100644
--- a/vm/interp/Stack.cpp
+++ b/vm/interp/Stack.cpp
@@ -1253,6 +1253,9 @@
                         if (obj->clazz == gDvm.classJavaLangVMThread) {
                             joinThread = dvmGetThreadFromThreadObject(obj);
                         }
+                        if (joinThread == NULL) {
+                            joinThread = dvmGetObjectLockHolder(obj);
+                        }
                         printWaitMessage(target, "on", obj, joinThread);
                     }
                 } else if (thread->status == THREAD_MONITOR) {