diff --git a/interface/src/main/java/xsbti/api/AbstractLazy.java b/interface/src/main/java/xsbti/api/AbstractLazy.java
new file mode 100644
index 000000000..bd21f166f
--- /dev/null
+++ b/interface/src/main/java/xsbti/api/AbstractLazy.java
@@ -0,0 +1,26 @@
+/* sbt -- Simple Build Tool
+ * Copyright 2010  Mark Harrah
+ */
+package xsbti.api;
+
+	import java.io.ObjectStreamException;
+
+public abstract class AbstractLazy<T> implements Lazy<T>, java.io.Serializable
+{
+	private Object writeReplace() throws ObjectStreamException
+	{
+		return new StrictLazy<T>(get());
+	}
+	private static final class StrictLazy<T> implements Lazy<T>, java.io.Serializable
+	{
+		private final T value;
+		StrictLazy(T t)
+		{
+			value = t;
+		}
+		public T get()
+		{
+			return value;
+		}
+	}
+}
\ No newline at end of file
diff --git a/interface/src/main/java/xsbti/api/Lazy.java b/interface/src/main/java/xsbti/api/Lazy.java
index 4a5642a01..1ee29b013 100644
--- a/interface/src/main/java/xsbti/api/Lazy.java
+++ b/interface/src/main/java/xsbti/api/Lazy.java
@@ -1,5 +1,5 @@
 /* sbt -- Simple Build Tool
- * Copyright 2008, 2009  Mark Harrah
+ * Copyright 2010  Mark Harrah
  */
 package xsbti.api;