diff --git a/Mage.Sets/src/mage/cards/s/Sentinel.java b/Mage.Sets/src/mage/cards/s/Sentinel.java
index 1c67461fe4..d5d2518b1f 100644
--- a/Mage.Sets/src/mage/cards/s/Sentinel.java
+++ b/Mage.Sets/src/mage/cards/s/Sentinel.java
@@ -105,7 +105,7 @@ class SentinelEffect extends OneShotEffect {
         Player controller = game.getPlayer(source.getControllerId());
         Permanent targetPermanent = game.getPermanentOrLKIBattlefield(targetPointer.getFirst(game, source));
         if (controller != null && targetPermanent != null) {
-            int newToughness = targetPermanent.getPower().getValue() + 1;
+            int newToughness = game.addWithOverflowCheck(targetPermanent.getPower().getValue(), 1);
             game.addEffect(new SetToughnessSourceEffect(new StaticValue(newToughness), Duration.Custom, SubLayer.SetPT_7b), source);
             return true;
         }