diff --git a/poly2d/f2d_tri.c b/poly2d/f2d_tri.c
index 7d15a95..b5c4c90 100644
--- a/poly2d/f2d_tri.c
+++ b/poly2d/f2d_tri.c
@@ -39,7 +39,7 @@ struct f2d *f2d_tri(const struct p2d *p)
 
 	t = p2d_hsort(p);
 	recurse_area(t, &last);
-	p2d_hier_free(t, 0);
+	p2d_hier_free(t);
 	return res;
 }
 
diff --git a/poly2d/p2d_area.c b/poly2d/p2d_area.c
index b0ef6b1..bc45a66 100644
--- a/poly2d/p2d_area.c
+++ b/poly2d/p2d_area.c
@@ -1,8 +1,8 @@
 /*
  * p2d_area.c - Fill a set of nested polygons
  *
- * Written 2012, 2013 by Werner Almesberger
- * Copyright 2012, 2013 Werner Almesberger
+ * Written 2012 by Werner Almesberger
+ * Copyright 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
@@ -39,6 +39,6 @@ struct p2d *p2d_area(const struct p2d *p, double first, double next)
 
 	t = p2d_hsort(p);
 	recurse_area(t, first, next, &last);
-	p2d_hier_free(t, 1);
+	p2d_hier_free(t);
 	return res;
 }
diff --git a/poly2d/p2d_hsort.c b/poly2d/p2d_hsort.c
index 2570211..07aa958 100644
--- a/poly2d/p2d_hsort.c
+++ b/poly2d/p2d_hsort.c
@@ -1,8 +1,8 @@
 /*
  * p2d_hsort.c - Hierarchical polygon sort
  *
- * Written 2012, 2013 by Werner Almesberger
- * Copyright 2012, 2013 Werner Almesberger
+ * Written 2012 by Werner Almesberger
+ * Copyright 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
@@ -92,17 +92,16 @@ struct p2d_hier *p2d_hsort(const struct p2d *p)
 }
 
 
-void p2d_hier_free(struct p2d_hier *t, bool free_poly)
+void p2d_hier_free(struct p2d_hier *t)
 {
 	struct p2d_hier *next;
 	struct p2d *p;
 
 	while (t) {
-		p2d_hier_free(t->holes, free_poly);
+		p2d_hier_free(t->holes);
 		p = &t->p;
 		next = p2d_to_hier(p->next);
-		if (free_poly)
-			p2d_free(p);
+		p2d_free(p);
 		t = next;
 	}
 }
diff --git a/poly2d/p2d_hsort.h b/poly2d/p2d_hsort.h
index 8f9b37c..e789656 100644
--- a/poly2d/p2d_hsort.h
+++ b/poly2d/p2d_hsort.h
@@ -1,8 +1,8 @@
 /*
  * p2d_hsort.h - Hierarchical polygon sort
  *
- * Written 2012, 2013 by Werner Almesberger
- * Copyright 2012, 2013 Werner Almesberger
+ * Written 2012 by Werner Almesberger
+ * Copyright 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
@@ -14,8 +14,6 @@
 #ifndef P2D_HSORT_H
 #define P2D_HSORT_H
 
-#include <stdbool.h>
-
 #include "poly2d.h"
 
 
@@ -29,6 +27,6 @@ struct p2d_hier {
 
 
 struct p2d_hier *p2d_hsort(const struct p2d *p);
-void p2d_hier_free(struct p2d_hier *t, bool free_poly);
+void p2d_hier_free(struct p2d_hier *t);
 
 #endif /* !P2D_HSORT_H */