diff --git a/include/r3.h b/include/r3.h
index fbf4a04..4dc6e02 100644
--- a/include/r3.h
+++ b/include/r3.h
@@ -99,9 +99,9 @@ edge * r3_node_find_edge(const node * n, const char * pat);
 void r3_node_append_edge(node *n, edge *child);
 
 
-node * r3_tree_insert_pathl(node *tree, char *path, int path_len, void * data);
+node * r3_tree_insert_pathl(node *tree, const char *path, int path_len, void * data);
 
-route * r3_tree_insert_routel(node *tree, int method, char *path, int path_len, void *data);
+route * r3_tree_insert_routel(node *tree, int method, const char *path, int path_len, void *data);
 
 #define r3_tree_insert_path(n,p,d) r3_tree_insert_pathl_(n,p,strlen(p), NULL, d)
 
diff --git a/src/node.c b/src/node.c
index eae7c56..ac9cc85 100644
--- a/src/node.c
+++ b/src/node.c
@@ -452,7 +452,7 @@ route * r3_route_createl(const char * path, int path_len) {
 }
 
 
-route * r3_tree_insert_routel(node *tree, int method, char *path, int path_len, void *data) {
+route * r3_tree_insert_routel(node *tree, int method, const char *path, int path_len, void *data) {
     route *r = r3_route_createl(path, path_len);
     if(!r)
         return NULL;
@@ -463,7 +463,7 @@ route * r3_tree_insert_routel(node *tree, int method, char *path, int path_len,
 
 
 
-node * r3_tree_insert_pathl(node *tree, char *path, int path_len, void * data)
+node * r3_tree_insert_pathl(node *tree, const char *path, int path_len, void * data)
 {
     return r3_tree_insert_pathl_(tree, path, path_len, NULL , data);
 }
diff --git a/tests/bench.c b/tests/bench.c
index b682ff8..f73127c 100644
--- a/tests/bench.c
+++ b/tests/bench.c
@@ -20,7 +20,6 @@
 
 unsigned long unixtime() {
     struct timeval tp;
-    long sec = 0L;
     if (gettimeofday((struct timeval *) &tp, (NUL)) == 0) {
         return tp.tv_sec;
     }
@@ -31,8 +30,6 @@ double microtime() {
     struct timeval tp;
     long sec = 0L;
     double msec = 0.0;
-    char ret[100];
-    
     if (gettimeofday((struct timeval *) &tp, (NUL)) == 0) {
         msec = (double) (tp.tv_usec / MICRO_IN_SEC);
         sec = tp.tv_sec;