diff --git a/libtrellis/include/Tile.hpp b/libtrellis/include/Tile.hpp
index 3c612ab..fa09022 100644
--- a/libtrellis/include/Tile.hpp
+++ b/libtrellis/include/Tile.hpp
@@ -7,6 +7,7 @@
 #include <utility>
 #include <regex>
 #include <cassert>
+#include <map>
 #include "CRAM.hpp"
 
 namespace Trellis {