diff --git a/cameo/path.c b/cameo/path.c
index 2abd18d..dfdb92f 100644
--- a/cameo/path.c
+++ b/cameo/path.c
@@ -1,8 +1,8 @@
 /*
  * path.c - Toolpath operations
  *
- * Written 2010-2011 by Werner Almesberger
- * Copyright 2010-2011 Werner Almesberger
+ * Written 2010-2012 by Werner Almesberger
+ * Copyright 2010-2012 Werner Almesberger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,6 +17,7 @@
 #include <assert.h>
 
 #include "util.h"
+#include "shape.h"
 #include "path.h"
 
 
@@ -316,6 +317,9 @@ struct path *path_offset(const struct path *path, int left, int notch)
 	int dog;
 
 	assert(path_is_closed(path));
+	if (path->first == path->last)
+		return circle(path->first->x, path->first->y, path->first->z,
+		    path->r_tool, path->r_tool, 0.1, path->id);
 	new = path_from(path);
 	prev = path->first;
 	for (p = path->first->next; p; p = p->next) {