diff --git a/src/board/board.cpp b/src/board/board.cpp
index 14db6b8..eabdbf6 100644
--- a/src/board/board.cpp
+++ b/src/board/board.cpp
@@ -888,7 +888,7 @@ void Board::take_move_null() {
 /*
  * Ref: https://www.chessprogramming.org/Perft#Perft_function
  */
-u64 Board::perft(int depth) {
+uint64_t Board::perft(int depth) {
     if (depth == 0)
         return 1ULL;
 
diff --git a/src/io/uci.cpp b/src/io/uci.cpp
index 5363c41..a178355 100644
--- a/src/io/uci.cpp
+++ b/src/io/uci.cpp
@@ -115,7 +115,7 @@ void uci_parse_go(Board &board, std::istringstream is, SearchInfo &info) {
 
     info.depth = (depth == -1) ? MAX_DEPTH : static_cast<uint8_t>(depth);
 
-    printf("time:%d start:%llu stop:%llu depth:%d timeset:%d",
+    printf("info string time:%d start:%llu stop:%llu depth:%d timeset:%d",
            time,info.start_time,info.stop_time,info.depth,info.time_set);
     std::cout << std::endl;