diff --git a/src/dungeon.c b/src/dungeon.c
index aac8266a8..9a43ed7ac 100644
--- a/src/dungeon.c
+++ b/src/dungeon.c
@@ -2073,7 +2073,7 @@ level_difficulty(void)
     }
     /* ring of aggravate monster */
     if (EAggravate_monster)
-        res += 15;
+        res = res > 25 ? 50 : res * 2;
     return res;
 }