diff --git a/resources/GlobalEffect.js b/resources/GlobalEffect.js
index 1d673a4..23b09c4 100644
--- a/resources/GlobalEffect.js
+++ b/resources/GlobalEffect.js
@@ -111,7 +111,9 @@ makeEffect(GlobalEffect, {
                 field.print(Text.weather_hail(3, subject));
             }
 
-            subject.hp -= Math.floor(subject.getStat(Stat.HP) / denominator);
+            var damage = Math.floor(subject.getStat(Stat.HP) / denominator);
+            if (damage < 1) damage = 1;
+            subject.hp -= damage;
         }
     }
 });