diff --git a/src/pathfinder/astar.cpp b/src/pathfinder/astar.cpp
index 1de398c16..e6b9cd958 100644
--- a/src/pathfinder/astar.cpp
+++ b/src/pathfinder/astar.cpp
@@ -22,6 +22,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "freecraft.h"
 #include "player.h"