--- a/src/user_interface.hh
+++ b/src/user_interface.hh
@@ -3,6 +3,7 @@
 
 #include "array_view.hh"
 #include "hash_map.hh"
+#include "keys.hh"
 
 #include <functional>
 
@@ -15,7 +16,6 @@ class DisplayLine;
 using DisplayLineList = Vector<DisplayLine, MemoryDomain::Display>;
 struct DisplayCoord;
 struct Face;
-struct Key;
 
 enum class MenuStyle
 {