diff --git a/573file/prop.c b/573file/prop.c
index 0339192..68c0e48 100644
--- a/573file/prop.c
+++ b/573file/prop.c
@@ -300,6 +300,11 @@ const char *prop_get_value_str(const struct prop *p) {
 }
 
 struct prop *prop_search_child(struct prop *p, const char *name) {
+  return (struct prop *)prop_search_child_const(p, name);
+}
+
+const struct prop *prop_search_child_const(const struct prop *p,
+                                           const char *name) {
   struct list_node *pos;
   struct prop *child;
 
diff --git a/573file/prop.h b/573file/prop.h
index b09eb51..7e59cb5 100644
--- a/573file/prop.h
+++ b/573file/prop.h
@@ -26,6 +26,8 @@ struct prop *prop_get_parent(struct prop *p);
 enum prop_type prop_get_type(const struct prop *p);
 const char *prop_get_value_str(const struct prop *p);
 struct prop *prop_search_child(struct prop *p, const char *name);
+const struct prop *prop_search_child_const(const struct prop *p,
+                                           const char *name);
 int prop_set_attr(struct prop *p, const char *key, const char *val);
 
 const struct attr *attr_get_next_sibling(const struct attr *a);