diff --git a/mvt.hpp b/mvt.hpp
index 94512d1b..6bdcbdcb 100644
--- a/mvt.hpp
+++ b/mvt.hpp
@@ -3,7 +3,7 @@
 
 #include <sqlite3.h>
 #include <string>
-#include <map>
+#include <unordered_map>
 #include <set>
 #include <vector>