diff --git a/features/stronghold.c b/features/stronghold.c
index a1c1432..ad84ab3 100644
--- a/features/stronghold.c
+++ b/features/stronghold.c
@@ -192,6 +192,9 @@ static int addStrongholdPiece(StrongholdPieceEnv *env, int typ, int x, int y, in
     }
     q->next = p;
 
+    if (*env->n >= env->nmax){
+        env->generationStopped = 1;
+    }
     return 1;
 }