diff --git a/ui-blob.c b/ui-blob.c
index 73a8c1d..3cda03d 100644
--- a/ui-blob.c
+++ b/ui-blob.c
@@ -13,7 +13,8 @@
 static char *match_path;
 static unsigned char *matched_sha1;
 
-static int walk_tree(const unsigned char *sha1, const char *base,int baselen, const char *pathname, unsigned mode, int stage) {
+static int walk_tree(const unsigned char *sha1, const char *base,int baselen,
+	const char *pathname, unsigned mode, int stage, void *cbdata) {
 	if(strncmp(base,match_path,baselen)
 		|| strcmp(match_path+baselen,pathname) )
 		return READ_TREE_RECURSIVE;
@@ -49,7 +50,7 @@ void cgit_print_blob(const char *hex, char *path, const char *head)
 		commit = lookup_commit_reference(sha1);
 		match_path = path;
 		matched_sha1 = sha1;
-		read_tree_recursive(commit->tree, NULL, 0, 0, paths, walk_tree);
+		read_tree_recursive(commit->tree, NULL, 0, 0, paths, walk_tree, NULL);
 		type = sha1_object_info(sha1,&size);
 	}
 
diff --git a/ui-tree.c b/ui-tree.c
index 5a2dd3f..9a837e2 100644
--- a/ui-tree.c
+++ b/ui-tree.c
@@ -62,7 +62,8 @@ static void print_object(const unsigned char *sha1, char *path)
 
 
 static int ls_item(const unsigned char *sha1, const char *base, int baselen,
-		   const char *pathname, unsigned int mode, int stage)
+		   const char *pathname, unsigned int mode, int stage,
+		   void *cbdata)
 {
 	char *name;
 	char *fullpath;
@@ -143,13 +144,14 @@ static void ls_tree(const unsigned char *sha1, char *path)
 	}
 
 	ls_head();
-	read_tree_recursive(tree, "", 0, 1, NULL, ls_item);
+	read_tree_recursive(tree, "", 0, 1, NULL, ls_item, NULL);
 	ls_tail();
 }
 
 
 static int walk_tree(const unsigned char *sha1, const char *base, int baselen,
-		     const char *pathname, unsigned mode, int stage)
+		     const char *pathname, unsigned mode, int stage,
+		     void *cbdata)
 {
 	static int state;
 	static char buffer[PATH_MAX];
@@ -176,7 +178,7 @@ static int walk_tree(const unsigned char *sha1, const char *base, int baselen,
 			return 0;
 		}
 	}
-	ls_item(sha1, base, baselen, pathname, mode, stage);
+	ls_item(sha1, base, baselen, pathname, mode, stage, NULL);
 	return 0;
 }
 
@@ -216,6 +218,6 @@ void cgit_print_tree(const char *rev, char *path)
 	}
 
 	match_path = path;
-	read_tree_recursive(commit->tree, NULL, 0, 0, paths, walk_tree);
+	read_tree_recursive(commit->tree, NULL, 0, 0, paths, walk_tree, NULL);
 	ls_tail();
 }