diff --git a/mods/d2k/rules/harkonnen.yaml b/mods/d2k/rules/harkonnen.yaml
index acda6aa32b..bbc53e23a6 100644
--- a/mods/d2k/rules/harkonnen.yaml
+++ b/mods/d2k/rules/harkonnen.yaml
@@ -94,6 +94,7 @@ MCVH:
 MCVH.starport:
 	Inherits: MCVH
 	Buildable:
+		Prerequisites: Heavy
 		Queue: Starport
 		BuiltAt: starporth
 	Valued: