diff -r 31ec3e55fa3d -r 6c255334120d src/jdk.jlink/share/classes/jdk/tools/jlink/internal/TaskHelper.java
--- a/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/TaskHelper.java	Tue Oct 29 11:33:25 2019 +0100
+++ b/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/TaskHelper.java	Tue Oct 29 08:26:55 2019 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -325,7 +325,7 @@
 
                                 Map<String, String> m = addArgumentMap(plugin);
                                 // handle one or more arguments
-                                if (arg.indexOf(':') == -1) {
+                                if (plugin.hasRawArgument() || arg.indexOf(':') == -1) {
                                     // single argument case
                                     m.put(option, arg);
                                 } else {