diff --git a/io/sys/darwin/path.c b/io/sys/darwin/path.c
index ff098d1..c420843 100644
--- a/io/sys/darwin/path.c
+++ b/io/sys/darwin/path.c
@@ -18,7 +18,7 @@ struct b_path {
 };
 
 static void path_release(struct b_object *obj);
-static void path_to_string(struct b_object *obj, struct b_stream *out);
+static void path_to_string(const struct b_object *obj, struct b_stream *out);
 
 static struct b_object_type path_type = {
 	.t_name = "corelib::path",
@@ -58,7 +58,7 @@ struct b_path *b_path_create_root()
 
 	b_string_append_cstr(path->pathstr, system_drive);
 	if (system_drive[system_drive_len - 1] != '\\') {
-		b_string_append_cstr(path->pathstr, "\\");
+		b_string_append_c(path->pathstr, '\\');
 	}
 
 	return path;
@@ -108,8 +108,7 @@ struct b_path *b_path_create_from_cstr(const char *cstr)
 			continue;
 		}
 
-		char s[] = {c, 0};
-		b_string_append_cstr(path->pathstr, s);
+		b_string_append_c(path->pathstr, c);
 		prev = c;
 	}
 
@@ -312,7 +311,7 @@ void path_release(struct b_object *obj)
 	b_string_release(path->pathstr);
 }
 
-void path_to_string(struct b_object *obj, struct b_stream *out)
+void path_to_string(const struct b_object *obj, struct b_stream *out)
 {
 	struct b_path *path = (struct b_path *)obj;