diff --git a/include/v8-debug.h b/include/v8-debug.h
index 10e8bef83b..0bdff8465a 100755
--- a/include/v8-debug.h
+++ b/include/v8-debug.h
@@ -276,8 +276,12 @@ class EXPORT Debug {
   static void SetMessageHandler(MessageHandler handler,
                                 bool message_handler_thread = false);
   static void SetMessageHandler2(MessageHandler2 handler);
+
+  // If no isolate is provided the default isolate is
+  // used.
   static void SendCommand(const uint16_t* command, int length,
-                          ClientData* client_data = NULL);
+                          ClientData* client_data = NULL,
+                          Isolate* isolate = NULL);
 
   // Dispatch interface.
   static void SetHostDispatchHandler(HostDispatchHandler handler,
diff --git a/src/api.cc b/src/api.cc
index 20d3f39bb5..e705237867 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -4904,10 +4904,17 @@ void Debug::SetMessageHandler2(v8::Debug::MessageHandler2 handler) {
 
 
 void Debug::SendCommand(const uint16_t* command, int length,
-                        ClientData* client_data) {
-  if (!i::Isolate::Current()->IsInitialized()) return;
-  i::Isolate::Current()->debugger()->ProcessCommand(
-      i::Vector<const uint16_t>(command, length), client_data);
+                        ClientData* client_data,
+                        Isolate* isolate) {
+  // If no isolate is supplied, use the default isolate.
+  if (isolate != NULL) {
+    i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
+    internal_isolate->debugger()->ProcessCommand(
+        i::Vector<const uint16_t>(command, length), client_data);
+  } else {
+    i::Isolate::GetDefaultIsolateDebugger()->ProcessCommand(
+        i::Vector<const uint16_t>(command, length), client_data);
+  }
 }