diff --git a/game-app/game-core/src/main/java/games/strategy/triplea/ai/pro/data/ProPurchaseOptionMap.java b/game-app/game-core/src/main/java/games/strategy/triplea/ai/pro/data/ProPurchaseOptionMap.java
index aafb396c274..db469fbfe01 100644
--- a/game-app/game-core/src/main/java/games/strategy/triplea/ai/pro/data/ProPurchaseOptionMap.java
+++ b/game-app/game-core/src/main/java/games/strategy/triplea/ai/pro/data/ProPurchaseOptionMap.java
@@ -103,9 +103,7 @@ public ProPurchaseOptionMap(final GamePlayer player, final GameData data) {
         ProLogger.debug("Air: " + ppo);
       } else if (Matches.unitTypeIsSea().test(unitType)) {
         final ProPurchaseOption ppo = new ProPurchaseOption(rule, unitType, player, data);
-        if (!ppo.isSub()) {
-          seaDefenseOptions.add(ppo);
-        }
+        seaDefenseOptions.add(ppo);
         if (ppo.isTransport()) {
           seaTransportOptions.add(ppo);
         }