diff --git a/mana_decay_provider_test.go b/mana_decay_provider_test.go
index acc0bb357..c4b35f921 100644
--- a/mana_decay_provider_test.go
+++ b/mana_decay_provider_test.go
@@ -242,7 +242,7 @@ func TestManaDecay_PotentialMana(t *testing.T) {
 			name:        "check if mana decay works for exactly the amount of epochs in the lookup table",
 			amount:      math.MaxInt64,
 			createdSlot: testTimeProvider.EpochStart(1),
-			targetSlot:  testTimeProvider.EpochStart(iotago.EpochIndex(365 + 1)),
+			targetSlot:  testTimeProvider.EpochStart(iotago.EpochIndex(len(testManaDecayFactors) + 1)),
 			result:      176096765253977030,
 			wantErr:     nil,
 		},
@@ -250,7 +250,7 @@ func TestManaDecay_PotentialMana(t *testing.T) {
 			name:        "check if mana decay works for multiples of the available epochs in the lookup table",
 			amount:      math.MaxInt64,
 			createdSlot: testTimeProvider.EpochStart(1),
-			targetSlot:  testTimeProvider.EpochStart(iotago.EpochIndex(3*365 + 1)),
+			targetSlot:  testTimeProvider.EpochStart(iotago.EpochIndex(3*len(testManaDecayFactors) + 1)),
 			result:      398066497737349705,
 			wantErr:     nil,
 		},