diff --git a/README.md b/README.md
index 6fc241b..16315e0 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,8 @@ r3_tree_insert_pathl(n ,"/post/{id}", strlen("/post/{id}") , &route_data );
 r3_tree_insert_pathl(n, "/user/{id:\\d+}", strlen("/user/{id:\\d+}"), &route_data );
 
 // let's compile the tree!
-r3_tree_compile(n);
+char *errstr = NULL;
+int errno = r3_tree_compile(n, &errstr);
 
 
 // dump the compiled tree
@@ -108,7 +109,9 @@ int route_data = 3;
 // insert the route path into the router tree
 r3_tree_insert_routel(n, METHOD_GET | METHOD_POST, "/blog/post", sizeof("/blog/post") - 1, &route_data );
 
-r3_tree_compile(n);
+char *errstr = NULL;
+int errno;
+errno = r3_tree_compile(n, &errstr);
 
 
 // in your http server handler
diff --git a/tests/check_tree.c b/tests/check_tree.c
index 49779a8..ee43441 100644
--- a/tests/check_tree.c
+++ b/tests/check_tree.c
@@ -55,11 +55,11 @@ static node * create_simple_str_tree() {
 
 START_TEST (test_compile)
 {
-    str_array *t;
-    node * n = create_simple_str_tree();
-
+    node *n;
     node *m;
-    edge *e ;
+    edge *e;
+
+    n = create_simple_str_tree();
 
 #ifdef DEBUG
     r3_tree_dump(n, 0);
@@ -134,7 +134,10 @@ START_TEST (test_pcre_patterns_insert_2)
     r3_tree_insert_path(n, "/zoo", NULL);
     r3_tree_insert_path(n, "/foo", NULL);
     r3_tree_insert_path(n, "/bar", NULL);
-    r3_tree_compile(n, NULL);
+
+    char *errstr = NULL;
+    r3_tree_compile(n, &errstr);
+
     r3_tree_dump(n, 0);
     node *matched;
     matched = r3_tree_match(n, "/post/11/22", NULL);
@@ -159,7 +162,10 @@ START_TEST (test_pcre_patterns_insert_3)
 
     r3_tree_insert_path(n, "/foo", NULL);
     r3_tree_insert_path(n, "/bar", NULL);
-    r3_tree_compile(n, NULL);
+
+    char *errstr = NULL;
+    r3_tree_compile(n, &errstr);
+
     r3_tree_dump(n, 0);
     node *matched;
 
@@ -205,7 +211,9 @@ START_TEST (testr3_tree_insert_pathl)
     r3_tree_insert_path(n, "/post/{handle}", NULL);
 
     r3_tree_insert_path(n, "/post/{handle}-{id}", NULL);
-    r3_tree_compile(n, NULL);
+
+    char * errstr = NULL;
+    r3_tree_compile(n, &errstr);
 
 #ifdef DEBUG
     r3_tree_dump(n, 0);