diff --git a/src/core/game/PlayerImpl.ts b/src/core/game/PlayerImpl.ts
index b6d199fc5..a83c85bfb 100644
--- a/src/core/game/PlayerImpl.ts
+++ b/src/core/game/PlayerImpl.ts
@@ -902,6 +902,9 @@ export class PlayerImpl implements Player {
     if (this._gold < this.mg.config().unitInfo(unit.type()).cost(this)) {
       return false;
     }
+    if (unit.owner() !== this) {
+      return false;
+    }
     return true;
   }