diff --git a/data/modifications.cfg b/data/modifications.cfg
index bd0c9d3f887..5287e55ffc3 100644
--- a/data/modifications.cfg
+++ b/data/modifications.cfg
@@ -5,6 +5,7 @@
     id=plan_unit_advance
     name=_"Plan Unit Advance"
     description=_"When playing a multiplayer game, you do not control what a unit advances to if it advances on another player's turn. With this modification you can set what your units advance to beforehand, either for a specific unit or for all units of the same type."
+    type=mp
 
     [options]
         [checkbox]