diff --git a/src/map_location.hpp b/src/map_location.hpp
index c3429d211a1e..d46358f812f0 100644
--- a/src/map_location.hpp
+++ b/src/map_location.hpp
@@ -24,6 +24,7 @@ class variable_set;
 #include <set>
 #include <string>
 #include <vector>
+#include <algorithm>
 
 /**
  * Encapsulates the map of the game.