diff --git a/tile.cc b/tile.cc
index 02b5cef..b2239b3 100644
--- a/tile.cc
+++ b/tile.cc
@@ -8,6 +8,7 @@
 #include <algorithm>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <limits.h>
 #include <zlib.h>