diff --git a/mods/d2k/rules/system.yaml b/mods/d2k/rules/system.yaml
index 40649701f4..d2e453aeab 100644
--- a/mods/d2k/rules/system.yaml
+++ b/mods/d2k/rules/system.yaml
@@ -22,7 +22,7 @@ Player:
 		BlockedAudio: NoRoom
 	ClassicProductionQueue@Starport:
 		Type: Starport
-		BuildSpeedModified: .2
+		BuildSpeedModifier: .2
 		LowPowerSlowdown: 2
 		BlockedAudio: NoRoom
 		QueuedAudio: OrderPlaced