diff --git a/src/battle_util.c b/src/battle_util.c
index 2f00f48cf979..079a9dd43633 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -5019,7 +5019,7 @@ u32 AbilityBattleEffects(u32 caseID, u32 battler, u32 ability, u32 special, u32
                 break;
             case ABILITY_SHED_SKIN:
                 if ((gBattleMons[battler].status1 & STATUS1_ANY)
-                 && (B_ABILITY_TRIGGER_CHANCE >= GEN_4 ? RandomPercentage(RNG_SHED_SKIN, 30) : RandomChance(RNG_SHED_SKIN, 1, 3)))
+                 && (B_ABILITY_TRIGGER_CHANCE == GEN_4 ? RandomPercentage(RNG_SHED_SKIN, 30) : RandomChance(RNG_SHED_SKIN, 1, 3)))
                 {
                 ABILITY_HEAL_MON_STATUS:
                     if (gBattleMons[battler].status1 & (STATUS1_POISON | STATUS1_TOXIC_POISON))
diff --git a/test/battle/ability/shed_skin.c b/test/battle/ability/shed_skin.c
index d3030b9baf49..279da677eaf5 100644
--- a/test/battle/ability/shed_skin.c
+++ b/test/battle/ability/shed_skin.c
@@ -1,11 +1,13 @@
 #include "global.h"
 #include "test/battle.h"
 
-SINGLE_BATTLE_TEST("Shed Skin triggers 30% of the time")
+SINGLE_BATTLE_TEST("Shed Skin triggers 33% of the time")
 {
-    PASSES_RANDOMLY(3, 10, RNG_SHED_SKIN);
+    if (B_ABILITY_TRIGGER_CHANCE == GEN_4)
+        PASSES_RANDOMLY(30, 100, RNG_SHED_SKIN);
+    else
+        PASSES_RANDOMLY(33, 100, RNG_SHED_SKIN);
     GIVEN {
-        ASSUME(B_ABILITY_TRIGGER_CHANCE >= GEN_4);
         ASSUME(gMovesInfo[MOVE_TACKLE].makesContact);
         PLAYER(SPECIES_WOBBUFFET);
         OPPONENT(SPECIES_ARBOK) { Status1(STATUS1_POISON); Ability(ABILITY_SHED_SKIN); }