diff --git a/.Lib9c.Tests/Action/ValidatorDelegation/AllocateRewardTest.cs b/.Lib9c.Tests/Action/ValidatorDelegation/AllocateRewardTest.cs
index 432fd8f751..c0850d9438 100644
--- a/.Lib9c.Tests/Action/ValidatorDelegation/AllocateRewardTest.cs
+++ b/.Lib9c.Tests/Action/ValidatorDelegation/AllocateRewardTest.cs
@@ -132,6 +132,7 @@ public void Execute_WithoutReward_Throw()
     [InlineData(1181126949)]
     [InlineData(793705868)]
     [InlineData(707058493)]
+    [InlineData(37149681)]
     public void Execute_Theory_WithStaticSeed(int randomSeed)
     {
         var fixture = new RandomFixture(randomSeed);
@@ -301,12 +302,13 @@ public RandomFixture(int randomSeed)
             ValidatorsInfos = CreateArray(_random.Next(1, 200), i =>
             {
                 var balance = GetRandomFAV(DelegationCurrency, _random);
-                var flag = _random.Next() % 2 == 0 ? VoteFlag.PreCommit : VoteFlag.Null;
+                var cash = GetRandomCash(_random, balance);
+                var flag = i == 0 || _random.Next() % 2 == 0 ? VoteFlag.PreCommit : VoteFlag.Null;
                 return new ValidatorInfo
                 {
                     Key = new PrivateKey(),
-                    Balance = balance,
-                    Cash = GetRandomCash(_random, balance),
+                    Balance = balance < MinimumDelegation ? MinimumDelegation : balance,
+                    Cash = cash < MinimumDelegation ? MinimumDelegation : cash,
                     VoteFlag = flag,
                 };
             });
diff --git a/.Lib9c.Tests/Action/ValidatorDelegation/ValidatorDelegationTestBase.cs b/.Lib9c.Tests/Action/ValidatorDelegation/ValidatorDelegationTestBase.cs
index 7ad175762b..ad40712287 100644
--- a/.Lib9c.Tests/Action/ValidatorDelegation/ValidatorDelegationTestBase.cs
+++ b/.Lib9c.Tests/Action/ValidatorDelegation/ValidatorDelegationTestBase.cs
@@ -45,12 +45,12 @@ public ValidatorDelegationTestBase()
     protected static BlockHash EmptyBlockHash { get; }
         = new BlockHash(CreateArray(BlockHash.Size, _ => (byte)0x01));
 
+    protected static FungibleAssetValue MinimumDelegation { get; } = DelegationCurrency * 10;
+
     protected PrivateKey AdminKey { get; } = new PrivateKey();
 
     protected IWorld World { get; }
 
-    protected FungibleAssetValue MinimumDelegation { get; } = DelegationCurrency * 10;
-
     protected static T[] CreateArray<T>(int length, Func<int, T> creator)
         => Enumerable.Range(0, length).Select(creator).ToArray();