diff --git a/when_changed/Program.cs b/when_changed/Program.cs
index 6ab179e..883680e 100644
--- a/when_changed/Program.cs
+++ b/when_changed/Program.cs
@@ -18,6 +18,7 @@ class Program
         private static State m_state;
         private static Object m_state_lock = new Object();
 
+        private static bool b_allow_dirty = false;
 
         public static void Main()
         {
@@ -37,6 +38,8 @@ public static void Run()
                 return;
             }
 
+            b_allow_dirty = args.Contains("--dirty");
+
             String thingToWatch = args[1];
             FileSystemWatcher watcher = createWatcher(thingToWatch);
 
@@ -123,8 +126,11 @@ private static void runCmd(string changed_file)
                 {
                     case State.Executing:
                         // Oh noeeees - it changed while we were executing. do it again straight after.
-                        Console.WriteLine(" -- output will be dirty - will run again soon...");
-                        m_state = State.ExecutingDirty;
+                        if (!b_allow_dirty)
+                        {
+                            Console.WriteLine(" -- output will be dirty - will run again soon...");
+                            m_state = State.ExecutingDirty;
+                        }
                         break;
                     case State.ExecutingDirty:
                         // Leave the flag dirty.
@@ -188,7 +194,7 @@ private static void waitThenRun(string filechanged)
 
             var startinfo = new ProcessStartInfo();
             startinfo.FileName = m_command;
-            startinfo.WindowStyle = ProcessWindowStyle.Minimized;
+            startinfo.WindowStyle = ProcessWindowStyle.Hidden;
 
             if (m_command_args.Length > 0)
             {