diff --git a/OpenRA.Mods.Cnc/TiberiumRefineryDockAction.cs b/OpenRA.Mods.Cnc/TiberiumRefineryDockAction.cs
index b8e21ee9f5..a8580f8015 100644
--- a/OpenRA.Mods.Cnc/TiberiumRefineryDockAction.cs
+++ b/OpenRA.Mods.Cnc/TiberiumRefineryDockAction.cs
@@ -44,21 +44,22 @@ namespace OpenRA.Mods.Cnc
 			{
 				dockedHarv = harv;
 				self.traits.Get<RenderBuilding>().PlayCustomAnim(self, "active");
-			}) );
-			harv.QueueActivity( new Drag(startDock, endDock, 11) );
-			harv.QueueActivity( new CallFunc( () =>
-			{
-				self.World.AddFrameEndTask( w1 =>
+				
+				harv.QueueActivity( new Drag(startDock, endDock, 12) );
+				harv.QueueActivity( new CallFunc( () =>
 				{
-					harvester.Visible = false;
-					harvester.Deliver(harv, self);
-				});
+					self.World.AddFrameEndTask( w1 =>
+					{
+						harvester.Visible = false;
+						harvester.Deliver(harv, self);
+					});
+				}, false ) );
+				harv.QueueActivity( new Wait(18, false ) );
+				harv.QueueActivity( new CallFunc( () => harvester.Visible = true, false ) );
+				harv.QueueActivity( new Drag(endDock, startDock, 12) );
+				harv.QueueActivity( new CallFunc( () => dockedHarv = null, false ) );
+				harv.QueueActivity( new Harvest() );	
 			}) );
-			harv.QueueActivity( new Wait(18) );
-			harv.QueueActivity( new CallFunc( () => harvester.Visible = true) );
-			harv.QueueActivity( new Drag(endDock, startDock, 11) );
-			harv.QueueActivity( new CallFunc( () => dockedHarv = null) );
-			harv.QueueActivity( new Harvest() );
 		}
 		
 	}
diff --git a/OpenRA.Mods.RA/Activities/CallFunc.cs b/OpenRA.Mods.RA/Activities/CallFunc.cs
index 1ccf27786f..d79d5c3eef 100644
--- a/OpenRA.Mods.RA/Activities/CallFunc.cs
+++ b/OpenRA.Mods.RA/Activities/CallFunc.cs
@@ -1,4 +1,4 @@
-#region Copyright & License Information
+#region Copyright & License Information
 /*
  * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
  * This file is part of OpenRA.
@@ -26,8 +26,14 @@ namespace OpenRA.Mods.RA.Activities
 	public class CallFunc : IActivity
 	{
 		public CallFunc(Action a) { this.a = a; }
-
+		public CallFunc(Action a, bool interruptable)
+		{
+			this.a = a;
+			this.interruptable = interruptable;
+		}
+		
 		Action a;
+		bool interruptable;
 		public IActivity NextActivity { get; set; }
 
 		public IActivity Tick(Actor self)
@@ -36,6 +42,13 @@ namespace OpenRA.Mods.RA.Activities
 			return NextActivity;
 		}
 
-		public void Cancel(Actor self) { a = null; NextActivity = null; }
+		public void Cancel(Actor self)
+		{
+			if (!interruptable)
+				return;
+			
+			a = null;
+			NextActivity = null;
+		}
 	}
 }
diff --git a/OpenRA.Mods.RA/Activities/Wait.cs b/OpenRA.Mods.RA/Activities/Wait.cs
index 8f5bd1b83e..fd3a4049cd 100644
--- a/OpenRA.Mods.RA/Activities/Wait.cs
+++ b/OpenRA.Mods.RA/Activities/Wait.cs
@@ -25,16 +25,29 @@ namespace OpenRA.Mods.RA.Activities
 	public class Wait : IActivity
 	{
 		int remainingTicks;
-
+		bool interruptable = true;
+		
 		public Wait(int period) { remainingTicks = period; }
-
+		public Wait(int period, bool interruptable)
+		{
+			remainingTicks = period;
+			this.interruptable = interruptable;
+		}
+		
 		public IActivity Tick(Actor self)
 		{
 			if (remainingTicks-- == 0) return NextActivity;
 			return this;
 		}
 
-		public void Cancel(Actor self) { remainingTicks = 0; NextActivity = null; }
+		public void Cancel(Actor self)
+		{
+			if (!interruptable)
+				return;
+			
+			remainingTicks = 0;
+			NextActivity = null;
+		}
 		public IActivity NextActivity { get; set; }
 	}
 }