diff --git a/a3/binary_search_tree.c b/a3/binary_search_tree.c
index daa541d..f95c12c 100644
--- a/a3/binary_search_tree.c
+++ b/a3/binary_search_tree.c
@@ -3,6 +3,17 @@
 #include <stdio.h>
 #include "binary_search_tree.h"
 
+void free_tree(node_t *tree) {
+    if (tree == NULL) {
+        return 0;
+    }
+
+    free_tree(tree->left);
+    free_tree(tree->right);
+
+    free(tree);
+}
+
 node_t *build_tree(int *tree_data, size_t tree_data_len){
 
     node_t *koren = (node_t *)malloc(sizeof(node_t));