diff --git a/a3/binary_search_tree.c b/a3/binary_search_tree.c
index b39fa0a..debef5a 100644
--- a/a3/binary_search_tree.c
+++ b/a3/binary_search_tree.c
@@ -13,7 +13,7 @@ node_t *build_tree(int *tree_data, size_t tree_data_len){
 
     if(tree_data != NULL && tree_data_len != 0){
         koren->data = tree_data[0];
-        koren->left = tree_data[0];
+        koren->left = (node_t *)tree_data[0];
     }
 
     return koren;